Tawbah

The verse that made Iblis cry:

وَالَّذِينَ إِذَا فَعَلُواْ فَـحِشَةً أَوْ ظَلَمُواْ أَنْفُسَهُمْ ذَكَرُواْ اللَّهَ فَاسْتَغْفَرُواْ لِذُنُوبِهِمْ

Translation: If they fall in sin or wrong their souls, they remember Allaah and ask forgiveness for their sins.

Anas b. Malik:

“When this verse was revealed, Iblis cried.”

● {تفسير ابن كثير ٣:١٣٥}

Tawbah is:

• to regret the sin
• to abandon it
• and to be determined to never return back to it again.

● [فتح الباري لابن رجب ١٤٤/١]