Who Has Mercy on His Creations

Rabban Gamliel says in the name of Rebbi: It is written (Devarim 13:18), “And He will give you mercy, and He will have mercy on you and will increase you.” Whoever has mercy on others will be treated with mercy from Shamayim, and whoever fails to have mercy on others will not be treated with mercy from Shamayim. He explained the passuk as follows: “And He will give you mercy” — the ability to have mercy on others, then, “and He will have mercy” – you will be treated with mercy from Shamayim.

(Shabbos 151b)