[If one says,] ‘I take upon myself [to give] half my erech’ — he gives half his erech; [but if he says,] ‘I take upon myself [to give] the erech of half of myself’ — he gives his whole erech. [If one says,] ‘I take upon myself [to give] half my worth’ — he gives half his worth; [but if he says,] ‘I take upon myself [to give] the worth of half of myself’ — he gives his whole worth. This is the rule: [For] anything upon which one’s life depends, he must give the erech of his entire self.