A.T. Robertson Commentary Luke 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." — Luke 2:24 (ASV)

A pair of turtledoves, or two young pigeons (Ζευγος τρυγονων η δυο νοσσους περιστερων). The offspring of the poor, costing about sixteen cents, while a lamb would cost nearly two dollars. The "young of pigeons" is the literal meaning.