It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Holy Prophet (peace and blessings be upon him) said: I have been commanded to fight the people until they say "La ilaha illallah" (there is no god but Allah). When they say the kalima, they have protected their lives and wealth from me, except for the right of this kalima, and their reckoning is with Allah. When the fitna of apostasy spread, Hazrat Umar Farooq (may Allah be pleased with him) said to Sayyiduna Siddiq Akbar (may Allah be pleased with him): How can you fight them when I heard the Holy Prophet (peace and blessings be upon him) say this? Hazrat Siddiq Akbar (may Allah be pleased with him) replied: By Allah! I will not differentiate between prayer and zakat, and I will surely fight those who separate the two. Hazrat Umar (may Allah be pleased with him) says: When I saw that Hazrat Abu Bakr (may Allah be pleased with him) was determined to fight, I realized that this was indeed the correct opinion.