Deuteronomy 23:21-23

ABP_Strongs(i)
  21 G1437 And if G1161   G2172 you shall vow G2171 a vow G2962 to the lord G3588   G2316 your God, G1473   G3756 you shall not G5549 pass time G591 to give G1473 it; G3754 for G1567 requiring, G1567 [3shall require it G2962 1 the lord G3588   G2316 2your God] G1473   G3844 from G1473 you; G2532 and G1510.8.3 it will be G1722 [2to G1473 3you G266 1sin].
  22 G1437 But if G1161   G3361 you should not G2309 want G2172 to make a vow, G3756 it is not G1510.2.3   G1473 a sin to you. G266  
  23 G3588 The things G1607 going forth G1223 through G3588   G5491 your lips G1473   G5442 you shall guard, G2532 and G4160 you shall do G3739 in which G5158 manner G2172 you made a vow G2962 to the lord G3588   G2316 your God G1473   G1390 in the matter of a gift G3739 which G2980 [2spoke G3588   G4750 1your mouth]. G1473