The Prophet peace be and blessings upon him established bonds of brotherhood between the Muhaajirun and the Ansaar putting them under an agreement and obligation to mutual welfare, benevolence and assistance. Each Ansaari took a Muhaajir brother.
The former sometimes went so far as to give his Muhaajir brother half of whatever he possessed in the form of houses, assets, lands and groves. Such was the enthusiasm of the Ansaars to share everything with their brothers‐infaith that they divided everything into two parts to draw lots for allocating their share. In most cases, they tried to give the Muhaajirun the fairer portion of their property.
An Ansaari would say to his émigrant brother “Behold, I shall divide my possessions into two halves.”
The Muhaajir, who was often an expert in commerce, would refuse and would answer, “May Allah bless you in your family and your possessions! Just inform me of where the market is?”
The Ansaar were magnanimous and self‐denying and the Muhaajir forbearing, self‐reliant.
Covenant between the muslims and jews
Shortly thereafter, the Prophet peace be and blessings upon him got a written document, which bound the Muhaajirun and the Ansaars to a friendly agreement. The covenant made the Jews a party to the treaty that guaranteed them the freedom of their rights and obligations. (Ibn Hisham, Vol. p. 501).
The call to prayer
After the Prophet peace be and blessings upon him had settled down and Islam was deeply entrenched in the soil of Madinah, the mode of calling the faithful to prayer caught the attention of the Prophet peace be and blessings upon him. He disliked the customs being employed by the Jews and Christians such as kindling fire or the use of bell and horn to summon the people to such a spiritual obligation.
Initially, the Muslims used to come by themselves for prayer at the scheduled time without any announcement or call at all. While different proposals were being considered, Allah guided the Muslims to the method of giving the call to prayer. A number of companions had a vision of the call in their dreams, which was approved by the Prophet peace be and blessings upon him and prescribed as the official procedure of assembling the Muslims for such a worship act. Bilal Ibn Rabah (may Allah be pleased with him) was entrusted by the Prophet peace be and blessings upon him to give the call to prayer and thus he came to be known as the muadhin of the Prophet peace be and blessings upon him and the leader of all those who would call the faithful to prayer ‘till the end of time.