Exodus
12:43
43 And
the LORD said unto Moses and Aaron, This is the ordinance of the Passover:
There shall no stranger eat thereof:
44 But every man's servant that is bought for money, when thou hast
circumcised him, then shall he eat thereof.
45 A foreigner and an hired servant shall not eat thereof.
46 In one house shall it be eaten; thou shall not carry forth ought of the
flesh abroad out of the house; neither shall ye break a bone thereof.
47 All the congregation of Israel shall keep it.
48 And when a stranger shall sojourn with thee, and will keep the Passover
to the
LORD, 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: for no uncircumcised person shall eat
thereof.
49 One law shall be to him that is home-born, and unto the
stranger that sojourns among you.
50 Thus did all the children of Israel; as the LORD commanded Moses and
Aaron, so did they.
51 And it came to pass the selfsame day, that the LORD did bring the
children of Israel out of the land of Egypt by their armies.
The mixed
multitude that came out of Egypt with the Children of Israel could not eat
the Passover. However, if they CHOSE to become a full convert, they would
be allowed to do so. In fact that would be a great decision, but it had to
be THEIR choice.