Synonyms and related words :
Bible oath, affirm, and candle, assert, assert under oath, asseverate, assurance, assure, attest, avouch, avouchment, avow, book, certify, confess, countersign, covenant, declare, depone, depose, express the belief, extrajudicial oath, faith, guarantee, ironclad oath, judicial oath, kiss the book, loyalty oath, make a promise, oath, oath of allegiance, oath of office, official oath, parole, pledge, plight, profess, promise, solemn declaration, solemn oath, state, swan, swear, swear by bell, swear the truth, swear to, swear to God, swear to goodness, test oath, testify, troth, underwrite, vouch, warrant, warranty, word, word of honor