be a vow: Leviticus 22:18-21, Leviticus 23:38; Numbers 15:3; Deuteronomy 12:6, Deuteronomy 12:11, Deuteronomy 12:17, Deuteronomy 12:26; Psalms 66:13, Psalms 116:14, Psalms 116:18; Nahum 1:15
a voluntary: Leviticus 22:23, Leviticus 22:29; Deuteronomy 12:6; Ezekiel 46:12
also the: Leviticus 19:5-8