Tosefta for Chullin 44:3
(ויקרא א, יד) תורים גדולים ולא קטנים
For [without the Biblical direction] I would have argued by an a fortiori argument thus: If turtle doves which are disqualified for sacrifice when small are nevertheless qualified when fully grown, pigeons which are qualified for sacrifice when small should surely be qualified when fully grown! It is, therefore, written, young pigeons, to indicate that only the small are qualified for sacrifice, but not the fully grown.
Tosefta Chullin
[What is] valid for the red heifer is invalid for the heifer whose neck is broken (Deut. 21:1-4), and what is valid for the heifer whose neck is broken is invalid for the red heifer (Hul. 1:6). And work [in the field] renders each of them unfit. B'nei yonah (young pigeons), once they are old enough to sip (see Hul. 22b:6), until their feathers become golden [are fit for sacrifice], [while] turtledoves, once they are able to fly, even if they are old [are fit for sacrifice], and consequently it is said, what is valid in turtledoves is invalid in b'nei yonah, and what is valid in b'nei yonah is invalid in turtledoves.
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