'Part' in the Bible

where thou diest, will I die, and there will I be buried: Jehovah do so to me, and more also, if aught but death part thee and me.

Tarry this night, and it shall be in the morning, that if he will perform unto thee the part of a kinsman, well; let him do the kinsman's part: but if he will not do the part of a kinsman to thee, then will I do the part of a kinsman to thee, as Jehovah liveth: lie down until the morning.