The first of the five fundamentals of Islam is “to say the kalimat ash-shahâda”; that is, one should say, “Ash’hadu an lâ ilâha illa’llâh wa ash’hadu anna Muhammadan ’abdûhu wa rasûluh.” In other words, a discreet person who has reached the age of puberty and who can talk has to say vocally, “On the earth or in the sky, there is no one but Allâhu ta’âlâ worthy of worship. The real being to be worshipped is Allâhu ta’âlâ alone. He is the Wâjib al-wujûd. Every kind of superiority exists in Him. No defect exists in Him. His name is Allah,” and to believe this absolutely with all one's heart. And also one should say and believe: “The exalted person who had a rose-pink skin, a white-reddish, bright and lovely face, black eyes and eye-brows; who had a blessed wide forehead, with a good temper; who shed no shadow on the ground, was soft-spoken and was called Arab because he was born in Mecca of Hashemite-descent, named Muhammad ibn ’Abdullah, is Allâhu ta’âlâ’s human slave (’abd) and messenger (rasûl).” The Prophet’s mother was Hadrat Âmina bint Wahab. He was born in Mekka [at the dawn of Monday, 20th of April, 571]. When he was forty, in the year called the ‘Bi’that’ year, he was informed that he was the Prophet. After this, he invited people to Islam for thirteen years in Mekka. Then he emigrated to Medina on the command of Allâhu ta’âlâ. There he spread Islam everywhere. Ten years later, he passed away in Medina on Monday 12, Rabî’ al-Awwal (July, 632).