Collecting interest (usury) makes God angry.

Bible:

Exodus 22:25

"If thou lend money to any of my people that is poor by thee, thou shalt not be to him as an usurer, neither shalt thou lay upon him usury."

Quran:

Surah Al-Baqara 275:

"Those who consume interest cannot stand [on the Day of Resurrection] except as one stands who is being beaten by Satan into insanity. That is because they say, "Trade is [just] like interest." But Allāh has permitted trade and has forbidden interest."