The word(s) "preach" appears 21 time(s) in 19 verse(s) in Quran in Mohsin Khan translation.

(1) It is not (possible) for any human being to whom Allah has given the Book and Al-Hukm (the knowledge and understanding of the laws of religion) and Prophethood to say to the people: "Be my worshippers rather than Allah's." On the contrary (he would say): "Be you Rabbaniyyun (learned men of religion who practise what they know and also preach others), because you are teaching the Book, and you are studying it."

(2) And when a community among them said: "Why do you preach to a people whom Allah is about to destroy or to punish with a severe torment?" (The preachers) said: "In order to be free from guilt before your Lord (Allah), and perhaps they may fear Allah."

(3) Has not the story reached them of those before them? - The people of Nuh (Noah), 'Ad, and Thamud, the people of Ibrahim (Abraham), the dwellers of Madyan (Midian) and the cities overthrown [i.e. the people to whom Lut (Lot) preached]; to them came their Messengers with clear proofs. So it was not Allah Who wronged them, but they used to wrong themselves.

(4) Allah said: "Verily, the invocation of you both is accepted. So you both keep to the Straight Way (i.e. keep on doing good deeds and preaching Allah's Message with patience), and follow not the path of those who know not (the truth i.e. to believe in the Oneness of Allah, and also to believe in the Reward of Allah: Paradise)."

(5) By no means will they escape (from Allah's Torment) on earth, nor have they protectors besides Allah! Their torment will be doubled! They could not bear to hear (the preachers of the truth) and they used not to see (the truth because of their severe aversion, in spite of the fact that they had the sense of hearing and sight).

(6) And We sent not (as Our Messengers) before you (O Muhammad صلى الله عليه و سلم) any but men, whom We sent revelation, (to preach and invite mankind to believe in the Oneness of Allah). So ask (you, O pagans of Makkah) of those who know the Scripture [learned men of the Taurat (Torah) and the Injeel (Gospel)], if you know not.

(7) Invite (mankind, O Muhammad صلى الله عليه و سلم) to the Way of your Lord (i.e. Islam) with wisdom (i.e. with the Divine Revelation and the Qur'an) and fair preaching, and argue with them in a way that is better. Truly, your Lord knows best who has gone astray from His Path, and He is the Best Aware of those who are guided.

(8) And recite what has been revealed to you (O Muhammad صلى الله عليه وسلم) of the Book (the Qur'an) of your Lord (i.e. recite it, understand and follow its teachings and act on its orders and preach it to men). None can change His Words, and none will you find as a refuge other than Him.

(9) Say: "Obey Allah and obey the Messenger, but if you turn away, he (Messenger Muhammad صلى الله عليه وسلم) is only responsible for the duty placed on him (i.e. to convey Allah's Message) and you for that placed on you. If you obey him, you shall be on the right guidance. The Messenger's duty is only to convey (the message) in a clear way (i.e. to preach in a plain way)."

(10) So obey not the disbelievers, but strive against them (by preaching) with the utmost endeavour with it (the Qur'an).