What is the ruling on someone who committed a sin and did not inwardly seek forgiveness for it, knowing that he would return to it?

Whoever sins must repent sincerely to Allah Almighty. Abandoning sincerity in seeking forgiveness due to the expectation of repeating the sin is from the whispers of Satan. The believer was created to be "prone to trials, repentant, forgetful, but when reminded, remembers." This means they are tested by sins, then repent, forget, then remember and repent again. Allah forgives sins and honors those who repent to Him, even if the sin is repeated.

The conditions for repentance are five: sincerity to Allah, abandoning the sin, regretting it, resolving not to return to it, and that it must be before the death rattle.