Shaqiq al-Balkhi said:
The sign(s) of (true) repentance are:
Crying over what has passed by (of one’s actions),
fear of falling into the sin (once again),
boycotting evil company, and
accompanying the righteous.
[Al-Siyar of al-Dhahabib (9/315)] – salaf.com
The Method Of Making Tawbah – Fatwa
Repentance (Tawba) – by Dr. Saleh as-Saleh (Rahimahullaah) – Transcribed
1747. Narrated ‘Abdullaah bin Mas’ood (radhi Allaahu anhu) : Allaah’s Messenger (Sallallaahu Alaihi Wasallam) said,
Allaah is more pleased with the repentance of His slave than a man who encamps at a place where his life is in jeopardy, but he has his riding animal carrying his food and water. He then rests his head and sleeps for a short while and wakes to find his riding animal gone. (He starts looking for it) and suffers exhausion from severe heat and thirst or what Allaah wished (him to suffer from). He then says, ‘I will go back to my place.’ He returns and sleeps again, and then (getting up), he raises his head to find his riding animal standing beside him.
[Saheeh Al-Bukhaari, Hadeeth No. 320, Vol. 8]
Source : The Book Of Repentance : Chapter 1 – Exhortation for At-Tauba (the repentance) and to be pleased for it. Al-Lulu Wal-Marjan, Compiled by : Fuwad Abdul-Baqi, Translated by : Dr. Muhammad Muhsin Khan