If the wealth of Bahrain comes …
When the Prophet died, the Khalifah (his successor), Abu Bakr As-Siddiq said, “Whoever received any promise from the Messenger of Allah or was owed any debt by him, then let him come to me and I will fulfill it on his behalf.” So Jabir bin `Abdullah came and related that the Messenger of Allah said,
«لَوْ قَدْ جَاءَ مَالُ الْبَحْرَينِ أَعْطَيْتُكَ هَكَذَا وَهَكَذَا وَهَكَذَا»
(If the wealth of Bahrain comes (to me), then I would give you such and such and such.) This meant that he would fill his hands with wealth. Therefore, when the wealth of Bahrain came (to them), Abu Bakr commanded Jabir to come and fill his hands from that wealth. Then, he commanded him to do so again, until he collected five hundred Dirhams. Then, Abu Bakr gave him its double along with it.(i.e. one thousand extra Dirhams).
Fath al Bari