'Avouched' in the Bible

Thou hast avouched Jehovah this day to be thy God, and that thou wouldest walk in his ways, and keep his statutes, and his commandments, and his ordinances, and hearken unto his voice:

and Jehovah hath avouched thee this day to be a people for his own possession, as he hath promised thee, and that thou shouldest keep all his commandments;