1 Samuel 16:5

And he said, peaceably I am come to sacrifice unto the Lord,
&c.] Which he could say with truth, it being one end of his coming, though not the only one for which he came, and which he was not obliged to tell:

sanctify yourselves, and come with me to the sacrifice;
prepare themselves for it, which was done by washing their garments and then attend with him, and assist him in the sacrifice:

and he sanctified Jesse and his sons, and called them to the sacrifice;
he ordered them to sanctify themselves; he distinguished them from the rest of the inhabitants, and invited them to partake of the feast, the remainder of the peace offerings.