Deeds which will save the believer in this world and the hereafter

It is narrated from Imam Sajjad (AS) who said: There are three deeds which will save the believer: Protecting his/her tongue from talking about other people and backbiting them; make himself/herself occupied with own affairs with deeds which are beneficial for this world and the hereafter; and crying a lot for his/her own mistakes [1].

[1] Tohaful Oqool, Page 204 and Beharul Anwaar, Vol. 75, Page 140, Hadith 3.