TSK
Treasury of Scripture Knowledge references in WEB.
"'If he can't afford a lamb, then he shall bring his trespass offering for that in which he has sinned, two turtledoves, or two young pigeons, to Yahweh; one for a sin offering, and the other for a burnt offering.
If she cannot afford a lamb, then she shall take two turtledoves, or two young pigeons; the one for a burnt offering, and the other for a sin offering: and the priest shall make atonement for her, and she shall be clean.'"
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."
For such a high priest was fitting for us: holy, guiltless, undefiled, separated from sinners, and made higher than the heavens;