Hebrews 11:4
4 By faith Abel offered to God a better sacrifice than Cain, through which he was approved as being righteous—God approving his gifts—and through faith, though he is dead, he still speaks.
Hebrews 11:6
6 And without faith it is impossible to please Him, for he who draws near to God must believe that He is and that He is a rewarder of those who seek Him.