Pirkei Avot §avot_04_11: Rabbi Eliezer ben Jacob said: he who performs one commandment acquires for hi...

Rabbi Eliezer ben Jacob said: he who performs one commandment acquires for himself one advocate, and he who commits one transgression acquires for himself one accuser. Repentance and good deeds are a shield against punishment. Rabbi Yochanan Hasandlar said: every assembly which is for the sake of heaven, will in the end endure; and every assembly which is not for the sake of heaven, will not endure in the end.