New Revised Standard Version
When you come to the land that the LORD will give you, as he has promised, you shall keep this observance.

New American Bible
Thus, when you have entered the land which the LORD will give you as he promised, you must observe this rite.

Douay-Rheims Bible
And when you have entered into the land which the Lord will give you, as he hath promised, you shall observe these ceremonies.

And when you have entered into the land which the Lord will give you, as he hath promised, you shall observe these ceremonies.

when

Deuteronomy 4:5 You know that I have taught you statutes and justices, as the Lord my God hath commanded me: so shall you do them in the land which you shall possess:

Deuteronomy 12:8,9 You shall not do there the things we do here this day, every man that which seemeth good to himself. . . .

Deuteronomy 16:5-9 Thou mayst not immolate the phase in any one of thy cities, which the Lord thy God will give thee: . . .

Joshua 5:10-12 And the children of Israel abode in Galgal, and they kept the phase, on the fourteenth day of the month at evening, in the plains of Jericho: . . .

Psalm 105:44,45 And he gave them the lands of the Gentiles: and they possessed the labours of the people: . . .

according

Exodus 3:8,17 And knowing their sorrow, I am come down to deliver them out of the hands of the Egyptians, and to bring them out of that land into a good and spacious land, into a land that floweth with milk and honey, to the places of the Chanaanite, and Hethite, and Amorrhite, and Pherezite, and Hevite, and Jebusite. . . .