Halakhah for Pesachim 226:9
ת"ר שלשה אוהבין זה את זה אלו הן הגרים ועבדים ועורבין
R'Nahman B'Isaac said: it is a duty to hate him, as it is said, The fear of th Lord is to hate evil.<span class="x" onmousemove="('comment',' Prov. VIII,13. ihrcjvu');"><sup>10</sup></span> R'Aha son of Raba asked R'Ashi: What about telling his teacher, that he should hate him? -Said he to him: If he knows that his teacher regards him as trustworthy as two [witnesses], he should tell him; but if not, he must not tell him.
Sefer HaChinukh
The commandment of removing a burden: To remove a burden from upon the donkey that is weary from its burden upon the way, as it is stated (Exodus 23:5), "If you see the donkey of your enemy, etc." - and the understanding of this enemy, is [another Jew]. And even though it is written (Leviticus 19:17), "Do not hate your brother in your heart," which [refers to a Jew] - the Sages said (Pesachim 113b) that this matter is for example that he saw him commit a sin privately, and he warned [the one sinning] but he did not yield, such that he is [then] permitted to hate him. And that which it states, "donkey," is not specifically a donkey, but rather that the Scripture expressed that which is common - as donkeys are [used for carrying] a burden. And it is written, "you must certainly relieve with him" - meaning to say, help him, from the usage (Nehemiah 3:8), "and they relieved Jerusalem," which is an expression of strengthening.
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