It is narrated from Imam Hussain (AS) who said:

Do not be of those who worry about sins committed by others but is neglectful of punishment for his/her own sins, because heaven cannot be attained by tricking God; and there is no other way for the human being to attain Divine Blessings and rewards except by obeying and servitude of Allah (SWT) [1].

[1] Beharul Anwaar, Vol. 75, Page 121.

Source: en.shafaqna.com