Be Mindful of Allaah’s Anger in Three Affairs- by Imaam Sufyaan Ath-Thawri
Sufyaan Ath-Thawree (rahimahullaah) said, ‘’Be mindful of Allaah’s Anger in three affairs: be mindful of falling short in that which you have been commanded; be mindful that Allaah sees you (always), whilst you are not pleased with what He has portioned for you (of the dunyah); be mindful that you seek for something from the worldly life and do not find it, so you become angry with your Lord’’.
[Siyar A’laam An-Nubulaa 7/244]
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Repentance:
https://www.salaficentre.com/2016/08/salaah-tawbah-prayer-repentance/
http://salaficentre.com/wp-content/uploads/2015/08/obligation1.pdf