Messenger of Allah (PBUH), according to Al-Bukhari, spread his both hands thrice in a gesture and indicated to Jabir (May Allah be pleased with him): "I will give you double handfuls of money thrice". Abu Bakr (May Allah be pleased with him), however, fulfilled the Prophet's promise during his caliphate.
This Hadith is suggestive of fulfillment of the deceased pledge by the ascendant, that is, his death will not invalidate it. Rather, the responsibility of fulfilling his pledge devolves upon his inheritors. Similarly, a new ruler is under obligation to carry out the commitment made by his predecessor on the government level.