Furthermore, the validity of an acknowledgement depends on the acknowledger making it of his own volition; any confession wrested under duress is invalid, unless he admits to something other than that for which he was coerced.

For the acknowledgement to be sound, the acknowledger must also not be under interdiction; a prodigal person’s admission of liability for wealth is therefore void.

Another condition is that he may not acknowledge ownership of something that lies in another person’s hand or under another’s guardianship—for instance, if a stranger were to acknowledge a debt on behalf of a minor, or in relation to an endowment administered by someone else.

Should the acknowledger claim that he was forced to confess and did not do so willingly, his plea is accepted when supported by a circumstance pointing to his truthfulness or by evidence for his claim.

A sick person’s acknowledgement of property in favor of a non-heir is valid, because no suspicion of collusion arises and illness generally prompts greater caution regarding one’s estate.

When someone makes a claim against another, and the defendant confirms it, that confirmation is valid and counts as an acknowledgement binding upon him, in light of the Prophet’s ﷺ saying, “There is no excuse for one who has confessed.”

Any wording that conveys the meaning suffices for an acknowledgement, such as telling the claimant, “You are correct,” “Yes,” or “I admit to that.”

It is permissible to make an exception of one-half or less in an acknowledgement. Thus, if he says, “I owe him ten except five,” he is liable for five. The practice of exception appears in the Book of Allah: “So he remained among them for a thousand years minus fifty.” (Q 29:14)