Companions are mentioned in the Quran in these verses:
[4:38] They give money to charity only to show off, while disbelieving in God and the Last Day. If one’s companion is the devil, that is the worst companion.
[6:128] The day will come when He summons all of them (and says): “O you jinns, you have claimed multitudes of humans.” Their human companions will say, “Our Lord, we enjoyed each others’ company until we wasted the life span You had set for us.” He will say, “Hell is your destiny.” They abide therein forever, in accordance with God’s will. Your Lord is Wise, Omniscient.
[6:129] We thus match the wicked to be companions of each other, as a punishment for their transgressions.
[7:27] O children of Adam, do not let the devil dupe you as he did when he caused the eviction of your parents from Paradise, and the removal of their garments to expose their bodies. He and his tribe see you, while you do not see them. We appoint the devils as companions of those who do not believe.
[11:48] It was proclaimed: “O Noah, disembark, with peace and blessings upon you, and upon nations who will descend from your companions. As for the other nations descending from you, we will bless them for awhile, then commit them to painful retribution.”
[22:13] He idolizes what is more apt to harm him than benefit him. What a miserable lord! What a miserable companion!
[37:40] Only God’s servants who are absolutely devoted to Him alone (will be saved).
[37:41] They have deserved provisions that are reserved specifically for them.
[37:42] All kinds of fruits. They will be honored.
[37:43] In the gardens of bliss.
[37:44] On furnishings close to one another.
[37:45] Cups of pure drinks will be offered to them.
[37:46] Clear and delicious for the drinkers.
[37:47] Never polluted, and never exhausted.
[37:48] With them will be wonderful companions.
[37:49] Protected like fragile eggs.
[37:75] Thus, Noah called upon us, and we were the best responders.
[37:76] We saved him and his family from the great disaster.
[37:77] We made his companions the survivors.
[41:25] We assign to them companions who adorn everything they do in their eyes. Thus, they end up incurring the same fate as the previous communities of jinns and humans, who were also losers.
[43:36] Anyone who disregards the message of the Most Gracious, we appoint a devil to be his constant companion.
[43:37] Such companions will divert them from the path, yet make them believe that they are guided.
[43:38] When he comes before us he will say, “Oh I wish you were as far from me as the two easts. What a miserable companion!”
[50:23] The companion said, “Here is my formidable testimony.”
[50:24] Throw into Gehenna every stubborn disbeliever.
[50:25] Forbidder of charity, aggressor, full of doubt.
[50:26] He set up beside God another god. Throw him into severe retribution.
[50:27] His companion said, “Our Lord, I did not mislead him; he was far astray.”
[50:28] He said, “Do not feud in front of Me; I have sufficiently warned you.
[50:29] “Nothing can be changed now. I am never unjust towards the people.”
[50:30] That is the day when we ask Hell, “Have you had enough?” It will say, “Give me more.”
[59:11] Have you noted those who are plagued with hypocrisy, and how they said to their companions in disbelief among the people of the scripture, “If you are evicted we will go out with you, and will never obey anyone who opposes you. If anyone fights you, we will fight on your side.” God bears witness that they are liars.
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