Hadith 613
Humaid At-Tawil narrates: I asked Sayyiduna Anas bin Malik (may Allah be pleased with him): Did the Prophet (peace and blessings be upon him) say this statement? "Remorse is repentance." He replied: Yes.
Hadith 614
Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates this statement of the Noble Prophet (peace and blessings of Allah be upon him): "Remorse is repentance."