C. F. Keil and Franz Delitzsch on Leviticus 14:21-32

Lev 14:21-32

In cases of poverty on the part of the person to be consecrated, the burnt-offering and sin-offering were reduced to a pair of turtle-doves or young pigeons, and the meat-offering to a tenth of an ephah of meal and oil; but no diminution was allowed in the trespass-offering as the consecration-offering, since this was the conditio sine qua non of reinstatement in full covenant rights. On account of the importance of all the details of this law, every point is repeated a second time in Lev 14:21-32.