Abu Ayyub al-Ansari
The land of Al-Masjid an-Nabawi belonged to two young orphans, Sahal and Suhayl, and when they came to know that Muhammad wished to acquire their land for the purposes of erecting a mosque, they went to Muhammad and offered the land to him as gift; Muhammad insisted on fixing and paying a price for the land precisely because they were orphaned children. The ultimately agreed purchase price was paid by Abu Ayyub al-Ansari who thus became the واقِف of Al-Masjid an-Nabawi on behalf of, or in favor of, Muhammad.