"Whoever says, when he enters the marketplace: 'La ilaha illallah wahdahu la sharika lahu, lahul-mulk wa lahul-hamdu, yuhyi wa yumitu, wa Huwa hayyun la yamutu, bi yadihil-khairu kulluhu, wa Huwa ala kulli shay’in Qadir (None has the right to be worshiped but Allah alone, with no partner, to Him belongs all sovereignty and to Him is the praise, He gives life and gives death, and He is Ever-Living and does not die; in His Hand is all goodness and He is Able to do all things),' Allah will record for him one million good deeds, and will erase from him one million bad deeds, and will build for him a house in Paradise. "
Sunan Ibn Majah Book 12, Hadith 99
Yahya related to me from Malik that Zayd ibn Aslam said, ''Umar
ibn al Khattab drank some milk which he liked (very much) and he asked
the man who had given it to him, 'Where did this milk come from?' The
man told him that he had come to a watering-place, which he named, and
had found grazing livestock from the zakat watering there. He was
given some of their milk, which he then put into his water-skin, and
that was the milk in question. Umar ibn al-Khattab then put his hand
into his mouth to make himself vomit."
Malik said, "The
position with us is that if anyone refuses to honour one of the
obligatory demands of Allah, and the muslims are unable to get it,
then they have the right to fight him until they get itfrom him."
Muwatta Malik Book 17, Hadith 34