1 Samuel 16:3-5

Call Jesse to the sacrifice. The word used is zebach, and means a sacrifice followed by a feast, at which all the elders of the town, and with them Jesse and his elder sons, would be present by the prophet's invitation. It is plain that such sacrifices were not unusual, or Saul would have demanded a reason for Samuel's conduct. As the ark remained so long in obscurity at Kirjath-jearim, and the solemn services of the tabernacle were not restored until Saul at some period of his reign removed it to Nob, possibly Samuel may have instituted this practice of occasionally holding sacrifices, now at one place and now at another, to keep alive a sense of religion in the hearts of the people; and probably on such occasions he taught them the great truths of the law, thus combining in his person the offices of prophet and priest. Nevertheless, the elders of the town trembled at his coming. More literally, "went with trembling to meet him." Very probably such visitations often took place because some crime had been committed into which Samuel wished to inquire, or because the people had been negligent in some duty. And though conscious of no such fault, yet at the coming of one of such high rank their minds foreboded evil. He quiets, however, their fears and bids them sanctify themselves; i.e. they were to wash and purify themselves, and abstain from everything unclean, and put on their festal garments. It is added, He sanctified Jesse and his sons , i.e. he took especial care that no legal impurity on their part should stand in the way of the execution of his errand.