Jude 3 (ESV)
Judgment on False Teachers
3 Beloved, although I was very eager to write to you about our common salvation, I found it necessary to write appealing to you to contend for the faith that was once for all delivered to the saints.
Hebrews 11:6 (ESV)
6 And without faith it is impossible to please him, for whoever would draw near to God must believe that he exists and that he rewards those who seek him.