וְאִם־לֹ֨א תַגִּ֣יע יָדוֹ֮ דֵּ֣י שֶׂה֒ וְהֵבִ֨יא אֶת־אֲשָׁמ֜וֹ אֲשֶׁ֣ר חָטָ֗א שְׁתֵּ֥י תֹרִ֛ים אֽוֹ־שְׁנֵ֥י בְנֵֽי־יוֹנָ֖ה לַֽיהוָ֑ה אֶחָ֥ד לְחַטָּ֖את וְאֶחָ֥ד לְעֹלָֽה׃
Que si ses moyens ne suffisent pas pour l’achat d’une menue bête, il offrira, pour la faute qu’il a commise, deux tourterelles ou deux jeunes colombes au Seigneur: l’une comme expiatoire, l’autre comme holocauste.
Sifra
1) (Vayikra 5:7): ("And if his hand cannot attain enough for a lamb, then he shall bring (the offering) of his guilt wherein he has sinned, two turtle-doves, etc.") "his hand": (The implication is that if he does not have the money, he is not told to borrow (for a rich man's offering, even if he has from whom to borrow) and not to ply his trade. If he has a lamb, and he does not have (enough for the food) that it needs (until he reaches Jerusalem), whence is it derived that he should bring a poor man's offering? From "enough for a lamb." "then he shall bring (the offering of his guilt wherein he has sinned, two turtle-doves or two young pigeons,": He must bring two; one does not suffice.
Ein Yaakov (Glick Edition)
(Fol. 9) R. Jeremiah used to say concerning the passage (Lev. 5, 5) And if his means be not sufficient, and again there is a passage (Ib. ib. 7) If he can not afford; all this speaks of persons that might become either poor or rich, which is not the case with either the High-priest or the priest anointed as the chaplain of the army; for concerning the latter, the passage says (Ib. 4, 22) Of all the things which the Lord his God, which signifies him who has for his superior, only his God; and concerning the High-priest, the passage says (Ib. 21, 10) And the priest that is highest among his brethren; i.e., he shall be highest in beauty, in might, in wisdom and in wealth. Acherim says: "Whence is it inferred that if he (the priest) is not rich, his people should make him so? The passage says highest among his brethren, i.e., he should be made great by his own brethren."
Sifra
2) (For otherwise I would say:) Does it not follow a fortiori — This one brings what he can afford and a metzora (a leper) brings what he can afford. Just as a metzora brings one (bird sin-offering) for one (lamb sin-offering, and one bird burnt-offering for one bird burnt-offering), this one, too, (in our case), since the rich man brings one (lamb), the poor man should bring one! Therefore, (to negate this) it is written "two turtle-doves or two young pigeons" — he brings two and not one.