[M]Know that the one who purifies the soul (zakkaha) succeeds; the
one who corrupts it fails. (Qur'an 91:7-10 — https://quran.com/91:7-10)
[M]Successful is the one who purifies themselves (tazakka). (Qur'an 87:14 — https://quran.com/87:14)
[1]Take zakah — it purifies and cleanses you through wealth. (Qur'an 9:103 — https://quran.com/9:103)
[1]Repent and turn to Allah constantly — repentance purifies the heart. (Qur'an 66:8 — https://quran.com/66:8)
[1]Guard your tongue from backbiting, slander, and gossip — these
corrupt the soul. (Qur'an 49:11-12 — https://quran.com/49:11-12)
[1]Struggle against your lower self (mujahadah) and avoid shaytan's
whispers. (Qur'an 24:21 — https://quran.com/24:21)
[1]Guard your chastity and lower your gaze — it is purer for you. (Qur'an 24:30-31 — https://quran.com/24:30-31)