Deuteronomy 11:21 KJV
That your days may be multiplied, and the days of your children, in the land which the LORD sware unto your fathers to give them, as the days of heaven upon the earth.
Deuteronomy 11:19–23 KJV Chapter Context
19
And ye shall teach them your children, speaking of them when thou sittest in thine house, and when thou walkest by the way, when thou liest down, and when thou risest up.
20
And thou shalt write them upon the door posts of thine house, and upon thy gates:
21
That your days may be multiplied, and the days of your children, in the land which the LORD sware unto your fathers to give them, as the days of heaven upon the earth.
22
For if ye shall diligently keep all these commandments which I command you, to do them, to love the LORD your God, to walk in all his ways, and to cleave unto him;
23
Then will the LORD drive out all these nations from before you, and ye shall possess greater nations and mightier than yourselves.