Reference for Chullin 261:17

למה אמרו נכסי כהן שקונה בהן עבדים וקרקעות ובהמה טמאה ובעל חוב נוטלן בחובו ואשה בכתובתה וספר תורה

the [terumah of the tithe of] dem'ai,<span class="x" onmousemove="('comment',' The produce bought from an 'am ha-arez was regarded as dem'ai, doubtful, for he could not be trusted as to the separation of the tithes. They were trusted, however, with regard to the separation of the terumah, for this had a higher degree of sanctity. Therefore the purchaser who scrupulously observes the law of tithing must separate from dem'ai (a) 'the terumah of the tithe', i.e., the portion due to the priest out of the First Tithe, and (b) the Second Tithe.');">¹⁴</span>

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