Fathwa, - Meaning of laa ilaaha illa Allah Muhammadun rasool ullah

Question: What is the meaning of the words "laa ilaahah illa allaah
muhammadun rasool ullaah"?
Answer:
Bearing witness "laa ilaahah illa allah" and that "muhammadun rasool
ullaah" is the first pillar of the five pillars of Islam. And the
meaning of "laa ilaahah illa allah" is that nothing worshipped is
worthy of worship except Allah—it is simultaneously a denial and
affirmation. "laa ilaahah" is denial of all worship other than that of
Allah. "illa allaah" is affirmation that all worship is for Allah
alone without partners.
As for the declaration, "muhammadun rasool ullaa," its meaning is the
assertion of the message of Mohammed (peace and blessings of Allah be
upon him) and to believe in it and to adhere to it by speech, action
and faith, and to avoid all that is against it, whether it be sayings,
actions, or intentions… In other words, obeying him in what he ordered
and believing in what he said and relayed and avoiding what he has
forbid and denounced and not worshipping Allah except as he has
ordained.
wa-sall-allahu wa-sallim 'ala nabiyyina muhammadin wa-aalihi
wa-sahbih. (May the peace and blessings of Allah be upon our prophet
Muhammad and upon his families and companions).