The word(s) "gain" appears 351 time(s) in 314 verse(s) in Quran in Mohsin Khan translation.

(261) Muhammad (صلى الله عليه وسلم) is the Messenger of Allah. And those who are with him are severe against disbelievers, and merciful among themselves. You see them bowing and falling down prostrate (in prayer), seeking Bounty from Allah and (His) Good Pleasure. The mark of them (i.e. of their Faith) is on their faces (foreheads) from the traces of prostration (during prayers). This is their description in the Taurat (Torah). But their description in the Injeel (Gospel) is like a (sown) seed which sends forth its shoot, then makes it strong, and becomes thick and it stands straight on its stem, delighting the sowers, that He may enrage the disbelievers with them. Allah has promised those among them who believe (i.e. all those who follow Islamic Monotheism, the religion of Prophet Muhammad صلى الله عليه وسلم till the Day of Resurrection) and do righteous good deeds, forgiveness and a mighty reward (i.e. Paradise).

(262) And if two parties or groups among the believers fall to fighting, then make peace between them both. But if one of them outrages against the other, then fight you (all) against the one that which outrages till it complies with the Command of Allah. Then if it complies, then make reconciliation between them justly, and be equitable. Verily! Allah loves those who are the equitable.

(263) And in 'Ad (there is also a sign) when We sent against them the barren wind;

(264) Do their minds command them this [i.e. to tell a lie against you (Muhammad صلى الله عليه وسلم)] or are they people transgressing all bounds?

(265) Or do they intend a plot (against you O Muhammad صلى الله عليه وسلم)? But those who disbelieve (in the Oneness of Allah - Islamic Monotheism) are themselves plotted against!

(266) Verily, We sent against them a furious wind of harsh voice on a day of evil omen and continuous calamity.

(267) Verily, We sent against them a single Saihah (torment - awful cry), and they became like the stubble of a fold-builder.

(268) Verily, We sent against them a violent storm of stones (which destroyed them all), except the family of Lut (Lot), them We saved in the last hour of the night,

(269) Are your disbelievers (O Quraish!) better than these [nations of Nuh (Noah), Lut (Lot), Salih, and the people of Fir'aun (Pharaoh) who were destroyed)? Or have you an immunity (against Our Torment) in the Divine Scriptures?

(270) There will be sent against you both, smokeless flames of fire and (molten) brass, and you will not be able to defend yourselves.