This week Joseph and Mary would take Jesus to the beautiful temple to fulfill the requirement of the Redemption Ceremony. The first born son of every Jewish family belonged to God. The baby must be presented at the Gate of the Firstborn in the Court of Men in the temple. The requirement for this sacrifice was an unblemished lamb. Mary and Joseph offered two doves. Why? That is all they could afford. They held a king, but could only afford the sacrifice of the poor.
God doesn't care about the value of the sacrifice. He only cares that the commandment is obeyed.