The word(s) "mission" appears 45 time(s) in 45 verse(s) in Quran in Abdullah Yusuf Ali translation.

(41) What! have they partners (in godhead), who have established for them some religion without the permission of Allah? Had it not been for the Decree of Judgment, the matter would have been decided between them (at once). But verily the Wrong-doers will have a grievous Penalty.

(42) It is not fitting for a man that Allah should speak to him except by inspiration, or from behind a veil, or by the sending of a messenger to reveal, with Allah's permission, what Allah wills: for He is Most High, Most Wise.

(43) He said: "What! Even if I brought you better guidance than that which ye found your fathers following?" They said: "For us, we deny that ye (prophets) are sent (on a mission at all)."

(44) He said: "The Knowledge (of when it will come) is only with Allah: I proclaim to you the mission on which I have been sent: But I see that ye are a people in ignorance!"..

(45) Therein come down the angels and the Spirit by Allah's permission, on every errand: