Image - a family celebrates shabbat
And the foreigners who join themselves to the Lord,
to minister to him, to love the name of the Lord,
and to be his servants,
all who keep the sabbath, and do not profane it,
and hold fast my covenant—
these I will bring to my holy mountain,
and make them joyful in my house of prayer;
their burnt offerings and their sacrifices
will be accepted on my altar;
for my house shall be called a house of prayer
for all peoples.

Isaiah 56:6-7