Sahih Muslim Book 45, Hadith 116
Make it a source of reward, and in the hadith transmitted on the authority of Abu Huraira (the words are):" Make it a source of mercy."
Jabir reported Allah's Apostle (ﷺ) a hadith like it but with a slight variation of wording.
O Allah, I make a covenant with Thee against which Thou wouldst never go. I am a human being and thus for a Muslim whom I give any harm or whom I scold or upon whom I invoke curse or whom I beat, make this a source of blessing, purification and nearness to Thee on the Day of Resurrection.