Midrash sa Exodo 17:12: Mekhilta DeRabbi Yishmael, Ein Yaakov (Glick Edition), Tanna DeBei Eliyahu Rabbah & Midrash Tanchuma

(Ibid. 17:12) "And the hands of Moses became heavy": From here we derive that one should not be lax in (the performance of) mitzvoth. For if Moses had not said to Joshua (Ibid. 9) "Choose men for us," he would not have been wearied thus. They said: Moses' hands became so heavy at that time as one who had two pitchers of water hung upon them.

(Fol. 11) Our Rabbis were taught: "When the community of Israel is in trouble and one withdraws himself from them [refusing to share their sorrow], two ministering angels who accompany each man lay their hands upon his head and say: 'The Baraitha we are taught: "When the community when in distress shall not live to see the relief of the community.' " In another Baraitha we are taught that when the community is in distress one must not say: 'I will go to my house, eat, drink and make myself comfortable'; for concerning him the passage reads (Is. 22, 13) And behold {there are) joy and gladness, in staying oxen, and killing sheep, eating flesh, and drinking wine; 'Let us eat and drink; for tomorrow) we must die'; and immediately follows: Truly this iniquity shall not be purged from you till you die. But a man must suffer (deny himself enjoyment), when the community suffers: for thus we find that Moses afflicted himself when the community suffered; as it is said (Ex. 17, 12) But when the hands of Moses became heavy, they took a stone, and put it under him, and he sat thereon. Did not Moses possess a pillow or bolster upon which he could have sat down? Yea; but Moses said thus: 'Since Israel lives in trouble I must therefore share their woes.' And he who afflicts himself in sympathy with the community, will live to see the relief of the community. One might perhaps say: 'Who will testify that I did not share the suffering of the community?' He should know that the stones and beams of his very house will bear testimony to this fact; as it is said (Hab. 2, 11) For the stone will cry out of the wall, and the beam out of the woodwork will answer it." In the college of R. Shila it was said that the two angels who accompany a man will testify against him; as it is said (Ps. 91, 11) For his angels will he given charge concerning thee. R. Chidka says: "The soul of man will testify against him; as it is said (Micah 7, 4) Keep the doors of thy mouth from her that lieth in thy bosom." Still others say that the members of a man's body will testify against him; as it is said (Is. 43, 10) Ye are my witnesses, saith the Lord.

One thing after another, the days were created, and not one of them is the seventh day forever, according to this world six thousand years, two thousand years, two thousand Torah, two thousand years, the son of David will die, and in our seasons many will go out, what went out, and will come in to work within two thousand years of the death of the son of David (more than 100 years) as it is said God did what he planned (Lamentations 2:17) and just as we make a shemitah once every seven years, so the Almighty will make a shemitah for the world one day which is a thousand years as it is said that a thousand years are in your eyes as yesterday (Psalms 90:4). And says And there was one day (Zechariah 14:7), this is the seventh day of the world, and at evening there was light (Zechariah 14:7), this is the world to come, which is said to be every month in its month, and every Sabbath in its Sabbath (Isaiah 66:23 ) And a psalm is said for the Sabbath day to the world that is all Sabbath. Another thing is a psalm a song for the Sabbath day that shuts off from the world. Another thing is a psalm a song for the Sabbath day is the seventh day to the world. And for the evening of the Sabbath it is the world to come in which there is no death for the eternal and the eternal, and in it there is neither sin nor iniquity nor plagues And no rebellions, but each and every one rejoices with his wisdom and understanding. How do you know that he did go out and learn from the Holy One, blessed be He, who rejoices in David in this world and the glory of heaven in the next world that was said and these are David's last words and ending "The utterance of is David the son of Ishai, and he utterance of the person who stands" on the mountains of learning, who accepted upon themselves the yoke of Torah and the yoke of mitzvot. What is your payment in front of Me? That you will be called 'the anointed of the God of Yaakov, and the sweet singer of Israel'. Happy is the person who sets themselves as an ox to the yoke, and as a donkey to the burden, and sits and meditates every day in Torah, always, immediately the Spirit of God rests on them, and the their Torah gets inside them, as it is written "Ho, everyone who thirsts, come for water" (Isaiah 55:1), and any mention of water really means Torah. How so? Explanation: a person reads Torah, prophets, writings, Mishnah, Halakhot, Agadot, and Midrash; and spends much time sitting, and little time in business, immediately the spirit of God is within that person, and His message are in that person's tongue, as it is written "The spirit of Ad-nai has spoken through me, His message is on my tongue" (II Sam 23:2). Happy is the person that plays with the words of the Torah and sits and chews on them like an animal that chews the cud on the field. ...