Tosefta על גיטין 3:8

The landowner may not separate terumah from tithes and [thereafter] obtain permission from the Levite, nor [take] the shankbone, the jawbone or the rough-stomach [of an animal, see Deut. 18:3] and [thereafter] obtain permission from the Kohen, but he may make them a loan in order for it to count [as terumah or priestly gifts, see Gitt. 3:8]