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Exodus 12:48

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48 And when a stranger shall sojourn with thee, and will keep the passover to Jehovah, let all his males be circumcised, and then let him come near and keep it; and he shall be as one that is born in the land: but no uncircumcised person shall eat thereof.

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Exodus 27:21

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21 In the tent of meeting, without the veil which is before the testimony, Aaron and his sons shall keep it in order from evening to morning before Jehovah: it shall be a statue for ever throughout their generations on the behalf of the children of Israel.