תּלמוד אויף משלי 6:1

Rabbi Yitzhak said: "One who angers his fellow, even merely through words, must appease him. As it is said: 'My son, if you take a pledge for your neighbor, if you clasp hands for a stranger, you are ensnared by the words of your mouth. Do this now, my son, and be saved, since you are at another's mercy: Go! Humble yourself and beg your neighbor.' (Proverbs 6:1-3)" If you have financial means, open the palm of your hand to him (i.e. pay him). And if not, gather many others around him.