Midrash for Proverbs 9:8

Variantly: "to all of Israel": They all could stand up under rebuke. R. Tarfon said: I swear if (i.e., that there is not) anyone in this generation who is capable of receiving rebuke. R. Akiva said: I swear if (i.e., that there is not) anyone in this generation who is capable of giving rebuke. R. Yochanan b. Nuri said: I testify by heaven and earth that more than five times R. Akiva was rebuked on my account before R. Gamliel and I know that he loved me even more (for it), in fulfillment of (Proverbs 9:8) "Reprove not a scorner lest he hate you. Reprove a wise man and he will love you."

(Fol. 65, b) R. El'ai said in the name of R. Elazar b. Shamua: "Just as it is meritorious for man to say a thing [of reproach] when it is heeded, so is it meritorious for man not to say a thing which will not be heeded." R. Abba said: "It is a sin, as it is said (Pr. 9, 8) Do not correct a scorner, lest he hate thee; reprove a wise man, and he will love thee:" R. El'ai said further in the name of R. Elazar b. Shamua: "It is permitted for a man to modify [a report] in the interest of peace, as it is said (Gen. 50, 16) Thy father did command, etc. So shall ye say unto Joseph: Oh, forgive, I pray thee." R. Jonathan says: "It is a duty [to modify,] as it is said (I Sam. 16, 2) And Samuel said: How shall I go? If Saul should hear it, he would kill me," etc. At the college of R. Ishmael it was taught: Peace is a great thing, for even the Holy One, praised be He! modified [Sarah's words] for her sake, as the verse says in the very beginning (Gen. 18, 12) and my Lord also being old, and afterwards it is said, and I am told."

9) R. Tarfon said: I swear that there is no one in this generation who is able to reprove, (for the one he reproves is likely to attribute even worse faults to him). R. Elazar b. Azaryah said: I swear that there is no one in this generation who is able to accept reproof. R. Akiva said: I swear that there is no one in this generation who knows how to give reproof. R. Yochanan b. Nuri said: I call heaven and earth as witness for me that more than four or five times Akiva was beaten because of me before R. Gamliel, to whom I would complain about him, and he loved me all the more for it, in keeping with (Mishlei 9:8) "Do not reprove a scoffer lest he hate you."

And Abraham rebuked Avimelech: R. Yosi ben R. Hanina said: Rebuke leads to love, as it says, rebuke a wise man and he will love you. Such indeed is R. Yosi ben Hanina’s view, for he said: Love unaccompanied by rebuke is not love. Resh Lakish said: Rebuke leads to peace; hence, ‘And Abrahman reproved Avimelech’. Such is his view, for he said: Peace unaccompanied by rebuke is not peace.