It means that their message of monotheism and worshiping Allah is the same and the essence is one but they differ in small details.

 Please explain the hadith statement:- The Prophets are brothers of the same father with different mothers, and their religion is one. Is this a metaphor and what does it mean?

Commentary on Hadeeth | March 14, 2015 2:45 pm
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In a book titled “Grave- Punishment and blessings”  by Husayn al-Awayishah, I read a hadith that the Prophet (salla Allahu Alaihi wa sallam) said “The deceased is punished by (the mourners) wailing for him”. But how is it the fault of the deceased if someone mourns over him? How can he stop someone to mourn over his death?
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One maulana in the masjid gave a daleel of sahih Muslim saying Jabir Bin Abdullah (radiy Allahu anhu) narrates that the Prophet (Salla Allahu alaihi wa sallam) once entered the masjid and told us why is that I am seeing you raising your hands like that of a horses tail, make sure you have sukoon in salaah. And then the maulana said this daleel is against rafayaain. can you please explain this?