Or riccar {is-sawr'}; from 'acar; an obligation or vow (of abstinence) -- binding, bond.
see HEBREW 'acar
H632. issar
אִסָּר noun masculineNumbers 30:8 bond, binding obligation (compare Biblical Aramaic אֱסָר, Syriac ; so forms with suffix below see BaNB 62 compare Sta§ 208 a; but perhaps Aramaic loan-word see LagBN 175) — ׳א absolute 30:3 +; construct 30:13; suffix אֶסְרָהּ 30:5; plural suffix אֱסָרֶיהָ 30:6; 30:15, אֱסָרֶהָ 30:8 — only Numbers 30 (P), binding obligation of oath or vow; mostly accusative of congnate meaning with verb אָסַר (q. v.); 30:3; 30:4; 30:5 (twice in verse); 30:6; 30:8; 30:11; 30:12; נַפְשָׁהּ אִסָּר 30:13; אִסָּר שְׁבֻעַת binding oath 30:14.