Deuteronomy 4:4

Thou shalt fear the LORD thy God; him shalt thou serve, and to him shalt thou cleave, and swear by his name.

Ye shall walk after the LORD your God, and fear him, and keep his commandments, and obey his voice, and ye shall serve him, and cleave unto him.

But take diligent heed to do the commandment and the law, which Moses the servant of the LORD charged you, to love the LORD 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 the LORD your God, as ye have done unto this day.

And they lifted up their voice, and wept again: and Orpah kissed her mother in law; but Ruth clave unto her. And she said, Behold, thy sister in law is gone back unto her people, and unto her gods: return thou after thy sister in law. And Ruth said, Entreat me not to leave thee, or to return from following after thee: for whither thou goest, I will go; and where thou lodgest, I will lodge: thy people shall be my people, and thy God my God: Where thou diest, will I die, and there will I be buried: the LORD do so to me, and more also, if ought but death part thee and me.

My soul followeth hard after thee: thy right hand upholdeth me.

I stretch forth my hands unto thee: my soul thirsteth after thee, as a thirsty land. Selah. Hear me speedily, O LORD: my spirit faileth: hide not thy face from me, lest I be like unto them that go down into the pit. Cause me to hear thy lovingkindness in the morning; for in thee do I trust: cause me to know the way wherein I should walk; for I lift up my soul unto thee. Deliver me, O LORD, from mine enemies: I flee unto thee to hide me. Teach me to do thy will; for thou art my God: thy spirit is good; lead me into the land of uprightness. Quicken me, O LORD, for thy name's sake: for thy righteousness' sake bring my soul out of trouble.