Deuteronomy 12:26

26Only thy holy things. This passage more clearly explains what was meant by the foregoing precepts, viz., that but one place was set apart for the performance of their sacred rites, lest, if each should offer wherever it pleased him, religion should be corrupted, and by degrees the various altars should beget as many gods. He therefore commands that all the victims should be sacrificed on one altar, with a provision that the blood should be poured out.