Q 3: Another question reads: You preach Tawhid (belief in the Oneness of Allah/ monotheism), so what is the proof you give to the Kalimah of Monotheism? From where is it derived? ?
A 3: The answer is that there are many proofs of this in the Book of Allah (Glorified and Exalted be He) [i.e. the Qur'an], and from the Sunnah of His Messenger (peace be upon him). Tawhid signifies the worship of Allah Alone i.e. the belief that He is One and that He has no partner. The verses indicating this meaning include Allah's (Exalted be He) saying,
And I (Allâh) created not the jinn and mankind except that they should worship Me (Alone).
And We did not send any Messenger before you (O Muhammad ﺻﻠﻰ ﺍﷲ ﻋﻠﻴﻪ ﻭﺳﻠﻢ) but We revealed to him (saying): Lâ ilâha illa Ana [none has the right to be worshipped but I (Allâh)], so worship Me (Alone and none else).
There are numerous verses with the same meaning.
The Hadith include the authentic Hadith related in Sahih AlBukhary from Ibn `Abbas (may Allah be pleased with them both) that the Prophet (peace be upon him) said to Mu`adh (may Allah be pleased with him), when he sent him to Yemen, Invite them be the (Tauhid ) monotheism of Allah. The above wording isrelated by AlBukhary in his Sahih [Book of Hadith].It is also related in Sahih Muslimon the authority of Tariq Ibn Ashyam AlAshja`y (may Allah be pleased with him) that the Prophet (peace be upon him) said, He who professed that there is none worthy of worship (in truth) but Allah and made a denial of everything which the people worship beside Allah, his property, and blood became inviolable, and his affairs rest with Allah. Thus, he stated, "He who professed that there is none worthy of worship (in truth) but Allah", implying that this is the meaning of "Lâ ilâha illa Ana (none has the right to be worshipped but Allah)".
These Hadith also include thatwhich is related in Sahih Muslimon the authority of Ibn `Umar (may Allah be pleased with them both) that the Prophet (peace be upon him) said, Islam is based on five pillars: testimony that there is no god but Allah ... This is an explanation of the Prophet's (peace be upon him) saying in the other narration Islam is based on five pillars: Testimony that there is no god but Allah and that Muhammad is the Messenger of Allah ...
There are numerous other Hadith to the same effect. Allah Alone is the Guide to success.