Hebrews 11:17

Have faith in God. Whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith.

Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them.—Without faith it is impossible to please him: for he that cometh to God, must believe that he is, and that he is a rewarder of them that diligently seek him.

What doth it profit, my brethren, though a man say he hath faith, and have not works? can faith save him? Faith, if it hath not works, is dead, being alone.

By faith Abraham, when he was tried, offered up Isaac: and he that had received the promises offered up his only begotten son. Accounting that God was able to raise him up, even from the dead.