Мидраш к Йешайау 45:19

[partial transl.] - [regarding II Sam. 23:1] [regarding II Sam. 23:1] "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. ...

"I am the L rd your G d who took you out of the land of Egypt." What is the intent of this? Because He appeared at the Red Sea as a hero waging war, viz. (Exodus 15:3) "The L rd is a Man of war," and at Mount Sinai, as an elder full of mercy, so as not to provide an opening for the nations of the world to say that there are two Deities, (He said) "I am the L rd your G d." It was I at the Red Sea, and it is I on the dry land. It was I in the past and it will be I in time to come. I in this world and I in the world to come. As it is written (Devarim 32:39) "See, now, that I, I am He," (Isaiah 46:4) "And until you grow old, it is I," (Ibid. 44:6) "Thus said the L rd, the King of Israel, and its Redeemer, the L rd of hosts: I am first and I am last," and (Ibid. 41:4) "Who wrought and did, the caller of the generations from the beginning? I, the L rd, am first, and with the last it will be I." R. Nathan says: This is the retort to those heretics who would contend that there are two Deities. When the Holy One Blessed be He stood (at Mount Sinai) and said "I am the L rd your G d," who stood up and contended with Him? If you would say that this took place in concealment, is it not written (Ibid. 45:19) "Not in secret did I speak, etc." I did not reserve it (the Torah) for them alone. And thus is it written (Ibid.) "I, the L rd, speak righteously; I tell what is true."

R. Yossi says: It is written (Isaiah 45:19) "Not in secrecy did I speak, in a place of darkness, etc." In the very beginning, when I gave it, I did not give it in secret or in a dark, dusky land. And I did not say to the seed of Jacob "Seek Me in vain" (i.e., gratis). I did not give it as a pledge (to be taken back), viz. (Ibid.) "I am the L rd, who speaks righteousness, who declares what is just." Even before I gave you the mitzvoth I "prefaced" their reward, viz. (Exodus 16:5) "And they shall prepare what they shall bring (of the manna) and it shall be double, etc." And it is written (Leviticus 25:21) "And I shall command My blessing for you in the sixth year, etc." I might think (that reward is given) only for these (Shabbath and Shevi'ith) alone (and not for other mitzvoth). It is, therefore, written (Psalms 105:44) "And He gave them the land of nations, etc." Why? (Ibid. 45) "So that they keep His statutes and observe His laws." ...