Midrash su Salmi 95:7

“It is the sound of my beloved knocking” – by means of Moses when he said: “Moses said: So said the Lord: At about midnight, I will emerge in the midst of Egypt” (Exodus 11:4). “Open for me” – Rabbi Yasa said: The Holy One blessed be He said to Israel: My children, open for Me one opening of repentance like the eye of the needle, and I will open for you openings that wagons and carriages enter through it.
Rabbi Tanḥuma, Rabbi Ḥunya, and Rabbi Abbahu [said] in the name of Reish Lakish: It is written: “Desist, and know that I am God…” (Psalms 46:11) – the Holy One blessed be He said to Israel: Desist from your evil actions and know that I am God. Rabbi Levi said: Were Israel to repent even one day, they would be redeemed immediately and the son of David would come immediately. What is the reason? “For He is our God, and we are the people of His flock and the sheep under His hand; today, if you heed His voice” (Psalms 95:7). Rabbi Yudan and Rabbi Levi say: The Holy One blessed be He said to Israel: Desist from your wicked actions and repent in the blink of an eye, “and know that I am God.”¹⁵Earnest repentance, even for a very short time, will lead to redemption, which will itself cause widespread recognition of God.
“My sister [aḥoti]” – as they were stitched [nitaḥu] to Me in Egypt with the blood of the paschal offering and the blood of circumcision. That is what is written: “I passed you and saw you wallowing in your blood, and I said to you, in your blood you shall live” (Ezekiel 16:6) – this is the blood of the paschal offering. “I said to you, in your blood you shall live” – this is the blood of circumcision (Ezekiel 16:6).
“My love [rayati]” – as they fell in love [sheriu] with Me at the sea and said: “This is my God and I will exalt Him” (Exodus 15:2), “the Lord will reign for ever and ever” (Exodus 15:18). “My dove” – at Mara, as from there they were commanded and became distinctive through all the mitzvot, acts of charity, and good deeds, like the dove that is distinctive.¹⁶A dove recognizes its mate, distinguishing it from among the other doves. That is what is written: “There He instituted for it statutes and ordinances” (Exodus 15:25). “My faultless [tamati]” – My wholehearted ones [tamuti], as they were wholehearted with Me at Sinai, and said: “Everything that the Lord said, we will perform and we will heed” (Exodus 24:7).
Rabbi Yannai said: My twin [teomati], as it were; I am not greater than it and it is not greater that I am.¹⁷God is as assiduous regarding the honor of the righteous of Israel as He is of His own honor. Rabbi Yehoshua of Sikhnin [said] in the name of Rabbi Levi: My twin [teomati], just as with twins, if one has a headache his counterpart feels it. So too, as it were, the Holy One blessed be He says: “I am with him in times of trouble” (Psalms 91:15).
“For my head is filled with dew” – on the basis of: “The earth quaked, the heavens dripped” (Psalms 68:9). “My locks, drops of night” – on the basis of what is stated: “The clouds dripped water” (Judges 5:4).

R. Alexandri said: "R. Joshua b. Levi raised the following contradiction: It is written: (Ib. 60, 22) "I, the Lord, will hasten it in its time." Hasten and in its time contradict each other, i.e., if they will be worthy, I will hasten it, and if not, they must wait till the appointed time will come." R. Alexandri said again: "R. Joshua b. Levi raised the following contradiction: It is written (Dan. 7, 13) Behold with the clouds of heaven came one like a son of man, … and it is also written: (Zech. 9, 9) Lowly, and riding upon an ass [hence he is poor]?" i.e., If they will be worthy, he will come with the clouds of heaven, and if not, he will come upon an ass." King Sabur said to Samuel: "You say that your Messiah will come upon an ass; let me send him the best horse of my stable." And he answered: "Do you possess a horse of a hundred colors as the ass of the Messiah?" R. Joshua b. Levi met Elijah standing at the entrance of the cave of R. Simon b. Jochai and asked him: "Will I have a share in the world to come?" And he answered: "If it will be the will of this Lord." R. Joshua b. Levi said: "I have seen two persons and the voice of the third have I heard." I then questioned them: 'When will the Messiah appear?' And they answered: 'Go and ask Messiah himself.' 'But where is he to be found?' 'At the gate of Rome.' 'And what is the sign [to recognize him]?' 'He goes among poor people afflicted with wounds. All the afflicted poor open the bandages of all their wounds, fix them and then dress them. And he opens one bandage, fixes the wound and dresses it, and then goes on to the next one, for the reason that when he might be called, there should be no delay [till all the wounds are dressed]. I went to him, and said: 'Peace be to thee, my master and teacher.' And he answered: 'Peace be with thee, bar Levi.' I asked him: 'When will the master appear?' He answered: 'This day.' I then went back to Elijah, and he questioned me as to what the Messiah said to me, and I told him that he said: 'Peace be with thee, bar Levi.' Elijah then said: 'I can assure you [now] of a share for thyself and for thy father in the world to come.' 'But he made a fool of me,' I said to Elijah, 'for he said that he will come this day.' And Elijah answered: 'The expression, this day, means as in (Ps. 95) Yea, this day, if you will hearken to his voice.' "

According to Rabbi Levi: If all of Israel were to keep Shabbat properly for even a single day, the Messiah ben David would come. Why? because it is equivalent to all of the commandments, as it is said (Ps. 95:7) "for He is our God, and we are the people He tends, the flock in His care. O, if you would but heed His charge this day:"