'Cleave' in the Bible

Only take diligent heed to do the commandment and the law which Moses the servant of Jehovah commanded you, to love Jehovah your God, and to walk in all his ways, and to keep his commandments, and to cleave unto him, and to serve him with all your heart and with all your soul.

but cleave unto Jehovah your God, as ye have done unto this day.

Else if ye do at all go back, and cleave unto the remnant of these nations, even these that remain among you, and make marriages with them, and go in unto them, and they to you;