Because it is contained in Scripture, "Behold, I lay in Zion a chief cornerstone, chosen, and precious: He who believes in him will not be disappointed."
Then in the book of Hebrews chapter thirteen, "Let us then offer unto God the sacrifice of praise, even the fruit of our lips unto him" ( Hebrews 13:15 ). So the spiritual sacrifices that we offer to God are our praises unto Him. Coming before Him with a broken heart, offering our praises to God.