The reports about coming back, and coming back again
The first of these is the one that answers the sentence you have been saying to yourself. In it a servant sins, asks forgiveness, is forgiven, and then does it again, and again, and is forgiven each time. It is in Bukhari. The second describes what the response to a person returning is actually like, and the register is joy rather than tolerance.
Qur’an and Sunnah
It was narrated from Anas that the Messenger of Allah (ﷺ) said:“Every son of Adam commits sin, and the best of those who commit sin are those who repent.’”
Sunan Ibn Majah 4251graded sound, albanifull report
Narrated Abu Huraira:I heard the Prophet (ﷺ) saying, "If somebody commits a sin and then says, 'O my Lord! I have sinned, please forgive me!' and his Lord says, 'My slave has known that he has a Lord who forgives sins and punishes for it, I therefore have forgiven my slave (his sins).' Then he remains without committing any sin for a while and then again commits another sin and says, 'O my Lord, I have committed another sin, please forgive me,' and Allah says, 'My slave has known that he has a Lord who forgives sins and punishes for it, I therefore have forgiven my slave (his sin). Then he remains without Committing any another sin for a while and then commits another sin (for the third time) and says, 'O my Lord, I have committed another sin, please forgive me,' and Allah says, 'My slave has known that he has a Lord Who forgives sins and punishes for it I therefore have forgiven My slave (his sin), he can do whatever he likes
Sahih al-Bukhari 7507graded sound, sahihaynfull report
Harith b. Suwaid said:I went to see 'Abdullah to inquire about his health as he was sick and he narrated to us a hadith of Allahs Messenger (ﷺ). He heard Allah's Messenger (ﷺ) as saying: Allah is more pleased with the repentance of His believing servant than a person who loses his riding beast carrying food and drink. He sleeps (being disappointed of its recovery) and then gets up and goes in search for that, until he is stricken with thirst. then comes back to the place where he had been before and goes to sleep completely exhausted placing his head upon his hands waiting for death. And when he gets up, lot there is before him his riding beast and his provisions of food and drink. Allah is more pleased with the repentance of His servant than the recovery of this riding beast along with the provisions (of food and drink)
Sahih Muslim 2744graded sound, sahihaynfull report
Abu Huraira reported Allah's Messenger (ﷺ) having said:By Him in Whose Hand is my life, if you were not to commit sin, Allah would sweep you out of existence and He would replace (you by) those people who would commit sin and seek forgiveness from Allah, and He would have pardoned them
Sahih Muslim 2749graded sound, sahihaynfull report