| make an affidavit(verb, expression, idiom, promise, swear) |
| pledge(verb, declare, undertake, promise, assure) |
| pledge oneself(verb, expression, promise, swear, covenant) |
| plight(verb, declare, undertake, promise, assure) |
| promise(verb, declare, undertake, assure, swear) |
| say so(verb, expression, promise, swear, covenant) |
| sign for(verb, expression, promise, swear, covenant) |
| state under oath(verb, expression, idiom, promise, swear) |
| swear(verb, declare, undertake, promise, assure) |
| swear on bible(verb, expression, idiom, promise, swear) |
| swear to God(verb, expression, idiom, promise, swear) |
| swear up and down(verb, expression, idiom, phrasal verb, declare) |
| take an oath(verb, expression, idiom, promise, swear) |
| testify(verb, declare, undertake, promise, assure) |
| undertake(promise, swear) |
| vouch(verb, declare, undertake, promise, assure) |
| warrant(verb, declare, undertake, promise, assure) |