Just as they said [that] a woman who impairs her kesubah is not paid except with an oath; and [that] one against whom a sin-gle witness testifies that it is paid is not paid except with an oath; [and that] from mortgaged property or from the property of orphans, she is not paid except with an oath; and [that] one who receives payment in his absence is not paid except with an oath —- so too orphans are not paid except with an oath [viz.]: “We swear that our father did not enjoin us, neither did our father tell us, nor have we found among our father's documents that this note is paid.” R' Yochanan ben Berokah says: Even if the son is born after the father's death —- he swears and collects. Said Rabban Shimon ben Gamliel: If there are witnesses that the father said at the time of his death, “This note is not paid” —- he collects without an oath.