1 Peter 1:19

19As of a lamb He means by this similitude, that we have in Christ whatever had been shadowed forth by the ancient sacrifices, though he especially alludes to the Paschal lamb. But let us hence learn what benefit the reading of the Law brings us in this respect; for, though the rite of sacrificing is abolished, yet it assists our faith not a little, to compare the reality with the type, so that we may seek in the former what the latter contains. Moses ordered a whole or perfect lamb, without blemish, to be chosen for the Passover. The same thing is often repeated as to the sacrifices, as in Leviticus 23:0; in Numbers 28:0; and in other places. Peter, by applying this to Christ, teaches us that he was a suitable victim, and approved by God, for he was perfect, without any blemish; had he had any defect in him, he could not have been rightly offered to God, nor could he pacify his wrath.