Lev 1:14 And if the burnt sacrifice for his offering to the LORD be of fowls, then he shall bring his offering of turtledoves, or of young pigeons.
The turtledoves were a poor persons offering. When baby Jesus was brought to the temple for his circumcision according to the law, Mary offered two turtledoves. What happened to the gold given to them by the wisemen? They must have used it when they fled into Egypt to escape Herod. The LORD never promised to make us rich, but he will meet our needs.
Luk 2:21 And when eight days were accomplished for the circumcising of the child, his name was called JESUS, which was so named of the angel before he was conceived in the womb.
Luk 2:22 And when the days of her purification according to the law of Moses were accomplished, they brought him to Jerusalem, to present him to the Lord;
Luk 2:23 (As it is written in the law of the Lord, Every male that openeth the womb shall be called holy to the Lord;)
Luk 2:24 And to offer a sacrifice according to that which is said in the law of the Lord, A pair of turtledoves, or two young pigeons.
If the person was able, she was to bring a lamb of the first year for a burnt offering; and a young pigeon, or a turtle dove, for a sin offering; but in case of poverty, then the above sufficed, and one of them was for a burnt offering, and the other for a sin offering; which shows not only that the virgin offered for herself a sin offering, being ceremonially unclean, but also her mean estate and poverty, in that she offered the offering of the poorer sort; see Lev 12:6. (John Gill)
Lev 12:6 And when the days of her purifying are fulfilled, for a son, or for a daughter, she shall bring a lamb of the first year for a burnt offering, and a young pigeon, or a turtledove, for a sin offering, unto the door of the tabernacle of the congregation, unto the priest:
Jesus was the Lamb of God that fulfilled all the requirements of the law.