Translation:

6. The Prophet is closer to the Believers than their own selves and his wives are their mothers. Blood-relations among each other have closer personal ties in the Decree of Allah than (the Brotherhood of) Believers and Muhajirs: nevertheless do ye what is just to your closest friends: such is the writing in the Decree (of Allah).

Notes (Tafseer)

3674. In human relationship the Prophet is entitled to more respect and consideration than blood-relations. The Believers should follow him rather than their fathers or mothers or brothers, where there is conflict of duties. He is even nearer-closer to our real interests-than our own selves.

3675. See last note. This Sura establishes the dignity and position of the Holy Prophet's wives, who had a special mission and responsibility as Mothers of the Believers. They were not to be like ordinary women: they had to instruct women in religious matters visit and minister to those who were ill or in distress, and do other kindly offices in aid of the Prophet's mission.

3676. In the early Madinah period, there was a bond of brotherhood between its inhabitants and the Muslims who migrated. This bond was the reason for mutual inheritance between them. Once the stability of Muslim Ummah was established, the law of inheritance according to blood relationship was revealed superceding the previous brotherhood relationship. This verse and verse No. 75 of Sura 8 abrogate the earlier arrangement.