Przysłów 27:10 Midrasz: Midrash Tanchuma, Vayikra Rabbah, Midrash Tehillim & Mekhilta DeRabbi Shimon Ben Yochai

Now Jethro heard (Exod. 18:1). Scripture says elsewhere: Thine own friend and thy father’s friend forsake not; neither go into thy brother’s house in the day of thy calamity; better is a neighbor that is near than a brother far off (Prov. 27:10). Thine own friend is the Holy One, blessed be He, who called Israel brother and friend, as it is said: For My brethren and friends’ sakes (Ps. 122:8). Thy father’s friend is Abraham, as is said: The seed of Abraham my friend (Isa. 41:8). Forsake not implies that if you would forsake God, remember what happened to the house of your brothers, Ishmael and Esau.⁹Better to rely on God than on brethren who betray you, as the descendants of Esau and Ishmael did at the destruction of the First Temple; see below.

Better is a neighbor that is near refers to Jethro, who was more friendly to Israel than Esau, the brother of Jacob. It is written concerning Jethro: And Saul said unto the Kenites: “Go, depart, get you down from the Amalekites, lest I destroy you with them; for ye showed kindness to all the children of Israel, when they came up out of Egypt.” So the Kenites departed from among the Amalekites (I Sam. 15:6).

“And if a person will sin, and hear the voice of adjuration, and he is a witness, who either saw or knew; if he does not tell, he shall bear his iniquity” (Leviticus 5:1).
“And if a person will sin, and hear the voice of adjuration, and he is a witness, who either saw or knew…” – that is what the verse said: “Do not be a witness against your friend in vain…” (Proverbs 24:28). “Do not be a witness…in vain” – this is Israel, as it is stated: “You are My witnesses, the utterance of the Lord, and I am God” (Isaiah 43:12). “Against your friend” – this is the Holy One blessed be He, as it is stated: “Do not forsake your friend and your father’s friend…” (Proverbs 27:10).¹See Shemot Rabba 27:1, where the word friend in this verse is interpreted as a reference to God. Do not deceive with your lips” (Proverbs 24:28) – after you beguiled Me²See Psalms 78:36. at Sinai and said: “Everything that the Lord has spoken we will perform and we will heed” (Exodus 24:7), ultimately at the end of forty days, you said to the calf: “This is your god, Israel” (Exodus 32:4). Rav Aḥa said: This is the Divine Spirit as an advocate, advocating for this party and that party. It says to Israel: “Do not be a witness…in vain.” Then it says to the Holy One blessed be He: “Do not say: I will do to him as he did to me” (Proverbs 24:29). Rabbi Yitzḥak said: It is written: “But they, like men,³Man is fallible with a tendency to sin. have violated the covenant” (Hosea 6:7). However, here: “For I am God⁴God’s tendency is to forgive. and not man” (Hosea 11:9).
Reuven knew testimony regarding Shimon.⁵This is a hypothetical case. The names Reuven, Shimon, and Levi are often used in rabbinic literature to refer to people in hypothetical circumstances. [Shimon] said to him: ‘Come and testify this testimony on my behalf.’ He said yes. When he entered before the judge, he reconsidered. The Divine Spirit said to him: “Do not deceive with your lips” (Proverbs 24:28) – after you beguiled him with your lips and brought him to trial, you recanted. The next day, testimony regarding Reuven came to Shimon. What will he do? Shall he do what he did to him? “Do not say: I will do to him as he did to me; I will repay the man according to his actions” (Proverbs 24:29). But did the Torah not already issue a decree: “And he is a witness, who either saw or knew; if he does not tell, he shall bear his iniquity.”