Isaiah 55:10-11

10. For as the rain cometh down, and the snow from heaven, and returneth not thither, but watereth the earth, and maketh it bring forth and bud, that it may give seed to the sower, and bread to the eater:

11. So shall my word be that goeth forth out of my mouth: it shall not return unto me void, but it shall accomplish that which I please, and it shall prosper in the thing whereto I sent it.

Psalm 89:34

34. My covenant will I not break, nor alter the thing that is gone out of my lips.

Psalm 105:8

8. He hath remembered his covenant for ever, the word which he commanded to a thousand generations.

Psalm 111:9

9. He sent redemption unto his people: he hath commanded his covenant for ever: holy and reverend is his name.

Psalm 119:89

89. For ever, O Lord, thy word is settled in heaven.

Matthew 5:18

18. For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.

John 3:12-13

12. If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things?

13. And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.

John 6:63

63. It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.