إِذْ قَالَ لَهُۥ رَبُّهُۥٓ أَسْلِمْ ۖ قَالَ أَسْلَمْتُ لِرَبِّ ٱلْعَٰلَمِينَ
When his Lord said to him, "Submit", he said "I have submitted [in Islam] to the Lord of the worlds."
Verse 131 defines the basic principle of the religion of Sayyidna Ibrahim (علیہ السلام) . Allah asked him to submit himself, and he willingly and gladly agreed to submit himself to "the Lord of the worlds." Let us add that the word of command employed in this verse is Aslim اَسلِم ، which comes from the same root as the word Islam. It is difficult to find an exact English equivalent, for the word signifies "to obey, to submit oneself, to surrender one's will." Anyhow, we should notice that in reply to the divine command, he did not say, as one would have expected, اَسلَمتُ لَک : "I submit myself to you," but, more elaborately: اَسلَمتُ لِرَبِّ الْعَالَمِين : "I submit myself to the Lord of the worlds." This particular form of reply expresses the attitude of respect and awe proper to the occasion, and includes the praise of Allah which the moment of receiving the honour of divine address demanded. It also carries a recognition of the fact that in submitting himself to the Lord of the worlds he was only performing the essential duty of a servant towards the Master of All, and doing it for his own benefit. The reply makes it clear that the basic principle of the religion of Sayyidna Ibrahim (علیہ السلام) ، and its very essence is contained in one word, Islam, which signifies total obedience and willing submission of oneself to Allah. It was to show to the world his perfect adherence to this principle that he was made to pass through all the trials before attaining his exalted station. Islam اسلام ، or submission to Allah, is what the world has been created for; it is the end all the prophets and all the divine books have been sent to serve.
We also learn from this verse that the religion common to all the prophets (علیہم السلام) and the point on which all of them come together is Islam اسلام . Beginning with Sayyidna Adam (علیہ السلام) upto the Last Prophet ﷺ every messenger of Allah and every prophet has called men to اسلام Islam alone, and enjoined upon his followers to keep to this Straight Path. The Holy Qur'an is quite explicit on this subject: إِنَّ الدِّينَ عِندَ اللَّـهِ الْإِسْلَامُ. "Certainly, in the eyes of Allah the only religion is Islam" (3:19) and وَمَن يَبْتَغِ غَيْرَ الْإِسْلَامِ دِينًا فَلَن يُقْبَلَ مِنْهُ "Whoso desires a religion other than Islam, it shall not be accepted of him." (3:85) In order to put the question in the proper perspective as also to avoid the risk of misunderstanding let us add a few remarks. All the religions which different prophets brought to the world had a divine sanction behind them, were essentially instituted by Allah Himself, and each of them was, in its own time, "accepted" in the sight of Allah. Consequently, each of these religions - whether one calls it Judaism or Christianity or something else - must in its essence be Islam, in the general sense of the word - namely, total submission to Allah.
But the religion of Sayyidna Ibrahim (علیہ السلام) is distinguished from others by a peculiar characteristic - that is, he gave to his religion the name of Islam, and to his followers the name of Muslims. We have al-ready seen in Verse, 128 how he prayed for himself, his son and his progeny: …