Online Bible Commentary on Matthew 2:14. And he arose and took the young child and his mother by night, and departed into Egypt;

Numbers 18:17. But the firstling of a cow, or the firstling of a sheep, or the firstling of a goat, thou shalt not redeem; they [are] holy: thou shalt sprinkle their blood upon the altar, and shalt burn their fat [for] an offering made by fire, for a sweet savour unto the LORD.


http://qbible.com/comments/matthew/2-14.html