Related for Bava Metzia 111:3
וחכ"א אחד הסיטון ואחד בעל הבית מוכר ושולח לחבירו ונותן לו במתנה ואינו חושש
but a private individual must tithe it in all cases:<span class="x" onmousemove="('comment',' If a private individual buys produce from an ignorant person, who is suspected of neglecting to tithe, and then resells, he must first tithe it, whether he sells large quantities, like a wholesaler, or small, like a retailer, because it will be assumed that he has in fact tithed it. ');"><sup>5</sup></span> this is R. Meir's view. But the Sages say: Both a wholesaler and a private individual may sell or send [produce] to his neighbour or give it to him as a gift without fear.<span class="x" onmousemove="('comment',' I.e., in large measure, because it is a general presumption that whenever corn is sold or given in large quantities it has not been tithed; therefore we have no fear that the recipient will omit to tithe it. This dispute shews that in respect to the actual tithing, i.e., the eating of demai, R. Meir is more stringent than the Rabbis. ');"><sup>6</sup></span>