Tosefta for Demai 2:3

An am ha'aretz that brings utensils for his purification, a chaver (i.e., one who is strict in matters of purity, see Dem. 2:3) may buy them from him for [purposes of] the purification rite as well as for [purposes of separating and storing] his Terumah. [If] he brought [utensils] for his Terumah, a chaver may not buy them from him neither for the purification rite nor for his Terumah. A chaver who said to an am ha'aretz, "Bring utensils for [my] purification," the chaver may buy them from him for his purification and for his Terumah. [If he said, "Bring utensils for] my purification," the chaver may not buy them from him, neither for his purification nor for his Terumah. [If he said,] "Bring [utensils] for my purification and for my Terumah of purification," the chaver may buy them from him, whether for himself or for someone else, as long as he did not try to circumvent the law [by going to an am ha'aretz]. And if he did try to circumvent the law, behold, they (i.e., the utensils and the items with which they came in contact) are impure. An am ha'aretz that said, "I brought these utensils for my purification, and I decided to use them for my Terumah," since they had been left alone with an am ha'aretz for a period of time [after he changed his mind and redesignated them], behold, they are impure.

[The Mishnah, Pes. 3:8, says that one who leaves Jerusalem and remembers that he is carrying consecrated meat may burn it where he stands if he has passed Mount Scopus, but otherwise he must return to the Temple and burn it there.] What is [Mount] Scopus? [It is the place from where] one sees [all of Jerusalem] and there is nothing that obstructs [his view]. You say, one who is on his way to slaughter the Passover offering, or to circumcise his son, or to eat at a betrothal feast in his father-in-law's house, and he remembers that he has chametz inside his house, if he has enough time to return, he returns [to his house and removes the chametz], and if not, he does not return [but rather he annuls it in his heart]. Rabbi Shimon ben Elazar says, any feast [hosted by an am ha'aretz] that is not in furtherance of a mitzvah, a chaver is not permitted to eat from it (see Dem. 2:3). If he passed [Mount] Scopus, he burns it (i.e., the consecrated meat) where he stands, and if not, he returns and burns it in front of the Temple with wood from the [Altar] pile. In other words, they only said that he need not return in order to make it easy on him. How much [consecrated meat or chametz triggers the requirement that] they return? Ben Beteira says, [if] it has at least the equivalent of two eggs'-bulk, but we did not find anyone who agreed with him (see Pes. 50a:2). [If] he wanted to burn it in front of the Temple with his own wood, or on its roof with wood from the [Altar] pile (see Zeb. 107b:14), we do not listen to him.

[If a man] was trustworthy but his wife was not trustworthy, we may purchase [produce] from him but we may not be guests at his house, and [that is so] even though the [Sages] said, behold, he is like one who dwells with a snake in a wicker basket (i.e., his wife will control what is served and he will not interfere). [If] his wife is trustworthy but he is not trustworthy, we may be guests and his house, but we may not purchase [produce] from them. [If] he is trustworthy and one of his sons is trustworthy, or one of his (male) servants is trustworthy [see Lieberman, ואחד מעבדיו נאמן], or one of his female servants is trustworthy, we purchase [produce] and we eat [their produce at their homes] on their word [that their produce is tithed] and we prepare food for them. [But] during Shevi'it (the seventh year of the agricultural cycle, when fields must lie fallow) as as to Taharot (foods requiring preparation in a state of ritual purity), we are not allowed to do that (i.e., trust them at their word). [Note: Unlike a chaver, one who is "only" trustworthy is only trusted in regards to tithing, but not as to whether produce was grown during Shevi'it, or in matters of Taharot, see, e.g., Dem. 2:2, Dem. 2:3, Dem. 3:4.]