Muhammad (c. 26 April 570 – 8 June 632; also transliterated as Mohammad, Mohammed, or Muhammed; Arabic: محمد‎), full name: Muhammad Ibn `Abd Allāh Ibn `Abd al-Muttalib (Arabic: محمد بن عبدالله بن عبد المطلب ‎) was a leader from Mecca who unified the tribes of Arabia into a single religious polity under Islam. He is believed by Muslims and Bahá'ís to be a messenger and prophet of God. Muslims believe that Islam was not his own invention but was revealed by God, and most consider him to be the last prophet of God Muslims thus consider him the restorer of an uncorrupted original monotheistic faith (islām) of Adam, Noah, Abraham, Moses, Jesus and other prophets.

Born in 570 CE in the Arabian city of Mecca, he was orphaned at an early age and brought up under the care of his uncle Abu Talib. He later worked mostly as a merchant, as well as a shepherd, and was first married by age 25. Being in the habit of periodically retreating to a cave in the surrounding mountains for several nights of meditation and prayer, he later reported that it was there, at age 40, that he received his first revelation from God. Three years after this event Muhammad started preaching these revelations publicly, proclaiming that "God is One", that complete "surrender" to Him (lit. islām) is the only way (dīn) acceptable to God, and that he himself was a prophet and messenger of God, in the same vein as other Islamic prophets.

Zakir Abdul Karim Naik (Urdu: ذاکر عبدالکریم نائیک; born 18 October 1965) is an Indian public speaker on the subject of Islam and comparative religion. He is the founder and president of the Islamic Research Foundation (IRF), a non-profit organisation that owns the Peace TV channel based in Dubai, UAE. He is sometimes referred to as a televangelist. Before becoming a public speaker, he trained as a doctor. He has written two booklets on Islam and comparative religion. He is regarded as an exponent of the Salafi ideology; he places a strong emphasis on individual scholarship and the rejection of "blind Taqlid", which has led him to repudiate the relevance of sectarian or Madh'hab designations, all the while reaffirming their importance.

Zakir Abdul Karim Naik was born on 18 October 1965 in Mumbai, India. He attended St. Peter's High School in Mumbai. Later he enrolled at Kishinchand Chellaram College, before studying medicine at Topiwala National Medical College and Nair Hospital and later the University of Mumbai, where he obtained a Bachelor of Medicine and Surgery (MBBS). His wife, Farhat Naik, works for the women's section of the IRF.