Volume 3, Book 39, Number 518 :
Narrated by Abu Huraira (radiallaahu `anhu)
The Ansar said to the Prophet (sallallaahu `alayhi wasallam), “Distribute the date palm trees between us and our emigrant brothers.” He replied, “No.” The Ansar said (to the emigrants), “Look after the trees (water and watch them) and share the fruits with us.” The emigrants said, “We listen and obey.”
The Ansaar were talking about the trees (or gardens) that they themselves owned.. they wanted to give away some of them to help the emigrants financially. Prophet (sallallaahu `alayhi wasallam) disliked to take anything away from their properties and he knew that Allah will grant them all enough wealth and riches soon, so he declined. Hence the Ansaar decided to hire the emigrants to work on their gardens and share the fruits with them as wages.
The people of Madinah truly earned this title: Ansaar (helpers). We see how selflessly they offered to help the emigrant brothers from Makkah in every way possible. And it is for this reason that Prophet (sallallaahu `alayhi wasallam) declared it a sign of faith to love the Ansaar.