Mishnah for Bekhorot 60:16
ת"ר
And similarly if a son of a Levite was prepared to accept the duties of the community of Levites<span class="x" onmousemove="('comment',' To sing, minister and serve as a gate-keeper of the Temple.');"><sup>6</sup></span>
Mishnah Demai
One who takes upon himself to become a “chaver” may not sell to an am haaretz either moist or dry [produce], nor may he buy from him moist [produce], nor may he be the guest of an am haaretz, nor may he host an am haaretz as a guest while [the am haaretz] is wearing his own garment. Rabbi Judah says: he may not also raise small animals, nor may make a lot of vows or merriment, nor may he defile himself by contact with the dead. Rather he should be an attendant at the house of study. They said to him: these [requirements] do not come within the general rule [of being a chaver].
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