In the future God will assign to each righteous man three hundred and
ten worlds as an inheritance; for it is said (Prov. viii. 21), "That I
may cause those that love me to inherit substance, and I will fill their
treasures." By Gematria equals three hundred and ten.
THE TALMUD, _Sanhedrin_, fol. 100, col. 1, and _Okitzin_, chap. 3, mish. 12.