The word(s) "mutual" appears 28 time(s) in 28 verse(s) in Quran in Abdullah Yusuf Ali translation.

(21) "And O my people! I fear for you a Day when there will be mutual calling (and wailing),-

(22) Those who hearken to their Lord, and establish regular Prayer; who (conduct) their affairs by mutual Consultation; who spend out of what We bestow on them for Sustenance;

(23) They will advance to each other, engaging in mutual enquiry.

(24) Know ye (all), that the life of this world is but play and amusement, pomp and mutual boasting and multiplying, (in rivalry) among yourselves, riches and children. Here is a similitude: How rain and the growth which it brings forth, delight (the hearts of) the tillers; soon it withers; thou wilt see it grow yellow; then it becomes dry and crumbles away. But in the Hereafter is a Penalty severe (for the devotees of wrong). And Forgiveness from Allah and (His) Good Pleasure (for the devotees of Allah). And what is the life of this world, but goods and chattels of deception?

(25) The Day that He assembles you (all) for a Day of Assembly,- that will be a Day of mutual loss and gain (among you), and those who believe in Allah and work righteousness,- He will remove from them their ills, and He will admit them to Gardens beneath which Rivers flow, to dwell therein for ever: that will be the Supreme Achievement.

(26) Let the women live (in 'iddat) in the same style as ye live, according to your means: Annoy them not, so as to restrict them. And if they carry (life in their wombs), then spend (your substance) on them until they deliver their burden: and if they suckle your (offspring), give them their recompense: and take mutual counsel together, according to what is just and reasonable. And if ye find yourselves in difficulties, let another woman suckle (the child) on the (father's) behalf.

(27) The mutual rivalry for piling up (the good things of this world) diverts you (from the more serious things),

(28) Except such as have Faith, and do righteous deeds, and (join together) in the mutual teaching of Truth, and of Patience and Constancy.