Deuteronomy 12:8

Moses points out that heretofore they had not observed the prescribed order in their worship, because during their migratory life in the wilderness it had been impossible to do so. During their wanderings there were doubtless times when the tabernacle was not set up for days together, and when the daily sacrifice Numbers 28:3, together with many other ordinances, were necessarily omitted (compare Joshua 5:5). This consideration must be carefully borne in mind throughout Deuteronomy. It illustrates the necessity for a repetition of very much of the Sinaitic legislation, and suggests the reason why some parts are so urgently reiterated and impressed, while others are left unnoticed. Moses now warns the people that as they were about to quit their unsettled mode of life, God's purpose of choosing for Himself a place to set His Name there would be executed, and the whole of the sacred ritual would consequently become obligatory. The "rest and safety" of Canaan is significantly laid down Deuteronomy 12:10-11 as the indispensable condition and basis for an entire fulfillment of the Law: the perfection of righteousness coinciding thus with the cessation of wanderings, dangers, and toils.

12:8 Here - Where the inconveniency of the place, and the uncertainty of our abode, would not permit exact order in sacrifices and feasts and ceremonies, which therefore God was then pleased to dispense with; but, saith he, he will not do so there. Right in his own eyes - Not that universal liberty was given to all persons to worship how they listed; but in many things their unsettled condition gave opportunity to do so.