Salmos 146:1 Midrash: Midrash Tanchuma Buber & Midrash Tehillim

Where it is stated (in Deut. 10:17): FOR THE LORD YOUR GOD IS GOD OF GODS…. See how great is < his > might and how great is < his > praise! Then what is written next (in vs. 18)? HE SECURES JUSTICE FOR THE ORPHAN AND WIDOW.
It is also written (in Ps. 138:6): FOR THOUGH THE LORD IS HIGH, HE HAS REGARD FOR THE HUMBLE….
It is also written (in Is. 57:15): [FOR] THUS SAYS THE HIGH AND EXALTED ONE, WHO INHABITS ETERNITY, WHOSE NAME IS HOLY: I INHABIT THE HIGH AND HOLY PLACE, WITH ONE ALSO THAT IS OF A CONTRITE AND HUMBLE SPIRIT.
It is also written (in Is. 66:1): THUS SAYS THE LORD: THE HEAVENS ARE MY THRONE AND THE EARTH IS MY FOOTSTOOL…. Then there is written (in vs. 2): ALL THESE MY HAND HAS MADE … YET UNTO THIS PERSON WILL I LOOK: UNTO ONE WHO IS POOR AND OF A CONTRITE SPIRIT.
And the rest are in the Book of Psalms (10:16): THE LORD IS KING FOR EVER AND EVER. Then there is written after that (in vs. 17): THE LONGING OF THE MEEK YOU HAVE HEARD, O LORD….
It is also written (in Ps. 68:5 [4]): SING TO GOD, PRAISE HIS NAME, BUILD A WAY FOR THE ONE WHO RIDES IN THE DESERT. What is written after it (in vs. 6 [5])? A FATHER OF ORPHANS AND AN ADVOCATE OF WIDOWS.
It is also written (in Ps. 146:1): HALLELUJAH. PRAISE THE LORD, O MY SOUL! And there is written in the same psalm (at vs. 6): WHO MADE HEAVEN AND EARTH. Then there is written (in vs. 7): WHO SECURES JUSTICE FOR THE OPPRESSED….

Another interpretation: "These are the servants of the Lord." These refer to the people of Israel, as it is said, "For they are My servants, the children of Israel" (Leviticus 25:55), and likewise it says, "Sing and rejoice, O daughter of Zion" (Isaiah 12:6). Another interpretation: "Hallelujah." Why doesn't it say "Praise the Lord"? Rabbi Yirmiyah said in the name of Rabbi Elazar, "This world is not worthy to praise the Lord in His entirety, but only in part, as it is said, 'Let every soul praise the Lord' (Psalm 150:6). Therefore, it says 'Hallelujah.' From here we learn that Hallel must have at least three verses, as it says, 'Hallelujah, praise God' (Psalm 146:1), which has two verses, and 'Hallelujah, praise God in His sanctuary' (Psalm 150:1), which has three verses. And one who says only one verse, it is as if he did not say Hallel at all. And similarly, it says, 'For I will proclaim the name of the Lord; ascribe greatness to our God' (Deuteronomy 32:3), which has one verse, and 'Sing to the Lord a new song' (Psalm 96:1), which has three verses. Therefore, it says 'Hallelujah.' Where do we learn that there were Hallel songs when Israel descended to Egypt, and there were 71 with the Divine Presence among them, as it says, "I will go down with thee into Egypt" (Genesis 46:4)? And it is written, "Thy fathers went down into Egypt with seventy persons" (Deuteronomy 10:22). And when the Holy One, blessed be He, ascended with them, it says, "I will also surely bring thee up again" (Genesis 46:4). Therefore, it says 'Hallelujah' for the number of 'Hallelujah.'

"Hallelujah, my soul, etc." Jeremiah said (Jeremiah 20:13), "Sing to the Lord, praise the Lord." Why? Because He saved the soul of the poor from the hand of evildoers. When God sends the wicked to Gehenna and saves the righteous, they praise Him, and they give Him praise that never leaves the poor. It is also said (Isaiah 57:19), "I create the praise of the lips." Not only I myself, but "Let all flesh bless His holy name." Therefore we say, "I will praise the Lord in my life; I will sing to my God as long as I exist." Solomon said (Ecclesiastes 9:12), "For man also does not know his time." If one does not praise while he is alive, when will he praise? Not when he dies, as it is said (Psalm 115:17), "The dead do not praise the Lord." And it is written (Psalm 6:6), "In death there is no memory of You." And who will praise You? But we will bless the Lord, "He who is alive, He who will praise You," not in Sheol. And it is said (Ecclesiastes 9:10), "For there is no work, nor knowledge, nor wisdom in Sheol." Therefore we say, "I will praise the Lord in my life," etc. Thus David said, "Do not trust in princes, in mortal man, in whom there is no salvation" (Psalm 146:3). A person should not say, "Ishmael can say, 'Abraham is my father, and he will save me,' or Esau can say, 'Jacob was righteous, and he will save me, and I will escape through his merit.'" As it is said (Psalm 49:8), "No man can redeem the life of another." No one's brother can redeem him. If a person does not do good in this world, he cannot rely on the deeds of his ancestors. Therefore it is said, "Do not trust in princes." On what should you rely? On your own deeds. As it is said (Proverbs 9:12), "If you are wise, you are wise for yourself, and if you scoff, you alone will bear it." Similarly, it is said (Proverbs 16:26), "A laborer's appetite works for him; his hunger urges him on." A person cannot eat from his father's actions in the future, but rather each person eats from their own actions, as it is said (Ecclesiastes 6:7), "All man's labor is for his mouth," and (ibid. 3:22), "So I saw that there is nothing better for a man than to enjoy his work." A person has no share except in their toil, as it is said (Psalm 128:2), "When you eat the toil of your hands, you are praiseworthy, and it is well with you." Therefore, it is said, "Do not rely on princes."