The Companies - 39:15
"Say, "You serve whomsoever you wish besides Him."Say, "The real losers are those who make themselves and their families lose on the Day of the Hereafter."This is the obvious loss"
In the context of verses 11, 12...19, it is about the people of the book who took Jesus and the prophet Uzeyr as gods besides God and wanted to add to or change the revelation according to their desires:
The Companies/39:13
"Say, "If I disobey my Lord, I fear the punishment of the Great Day."
The Repentance/9:30
"The Jews said: "Uzeyr is the son of Allah". And the Christians said: "Christ is the son of Allah". This is the word of their mouths. They imitate the words of those who disbelieved before. Allah will condemn them. How are they being converted?"
The Ornaments of Gold/43:57
When the son of Mary was shown as an example, your people immediately rejected.
The Ornaments of Gold/43:58
"They said: "Are our gods better or is he?"They said this only to argue with you. They are indeed a quarrelsome people."
The Family Of Imran/3:59
"For Allah, the example of Jesus is like the example of Adam; He formed him from the dust of the ground, then said to him, "Be,"and he became."
The Family Of Imran/3:60
This is the truth from your Lord; do not be of those who doubt.
The Family Of Imran/3:61
"And whoever disputes with you about this after this knowledge has come to you, say: "Come, let us and you come together, calling our children and your children, and our women and your women, and then let us curse so that the curse of Allah may be upon the liars."
The Family Of Imran/3:62
This is the truth of the rumors. There is no god besides Allah, and surely Allah is Mighty, Wise.
The Repentance/9:31
They took the scribes and the religious leaders and the Messiah, the son of Mary, as gods apart from God. But they were commanded to serve only one God. There is no god but Him. And He is Most High from those whom they associate as partners.
The Table Spread/5:49
You should judge between them by what Allah has revealed. Do not follow their pleasure. And let them not mislead you from some of what Allah has revealed to you. If they turn away, it means that Allah wants to punish them for some of their sins. Indeed most of the people have gone astray.
The Cow/2:120
"Neither the Jews nor the Christians will be pleased with you unless you enter into their religion. Say: "The right way is the way of Allah."If you follow their desires after the knowledge that has come to you, you will find neither a friend nor a supporter to defend you against Allah."
Prophet Jonah/10:15
"When Our clear Verses are recited to them, those who do not hope to meet Us say: "Bring another Qur´an other than this, or change it!"Say: "I cannot change it from my own side. I follow only what has been revealed to me. If I disobey my Lord, I fear the punishment of a great Day."
The Night Journey/17:73
They would almost have led you astray from what We have revealed to you so that you might invent something else and attribute it to Us. Then they would have taken you as a friend.
The Night Journey/17:74
If We had not made you firm, you would almost have inclined to them a little
The Night Journey/17:75
Then We would have made you taste the torment of life and death multiplied, then you would not have found any helper against Us.
The Pen/68:8
So do not follow those who deny.
The Pen/68:9
They wanted you to compromise so that they might compromise.
The Sure Truth/69:44
If He attributes to us some words,
The Sure Truth/69:45
We seize him by force,
The Sure Truth/69:46
Then We would cut off the revelation from him.
The Ants/27:91
I have been commanded to serve only the Lord of this city, He has sanctified it and to Him belongs everything. I have been commanded to be of the Muslims.
The Companies/39:11
"Say, "I have been commanded to serve Allah alone in worshipping Him."
The Companies/39:12
And I have been commanded to be a Muslim to the highest degree.
The Companies/39:14
"Say, "I dedicate my religion to Allah alone and serve Him."
The Companies/39:15
"Say, "You serve whomsoever you wish besides Him."Say, "The real losers are those who make themselves and their families lose on the Day of the Hereafter."This is the obvious loss"