عَنْ أُبَيِّ بْنِ كَعْبٍ رَضِيَ اللَّهُ عَنْهُ أَنَّ الْمُشْرِكِينَ قَالُوا لِلنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ انْسِبْ لَنَا رَبَّكَ فَأَنْزَلَ اللَّهُ تَبَارَكَ وَتَعَالَى قُلْ هُوَ اللَّهُ أَحَدٌ اللَّهُ الصَّمَدُ لَمْ يَلِدْ وَلَمْ يُولَدْ وَلَمْ يَكُنْ لَهُ كُفُوًا أَحَدٌ [الإخلاص: 1-4]
It is narrated from Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) that when the polytheists said to the Noble Prophet (peace and blessings be upon him): "Describe to us the lineage of your Lord," Allah Almighty revealed this Surah: {قُلْ ھُوَ اللّٰہُ اَحَدٌ۔ اَللّٰہُ الصَّمَدُ۔ لَمْ یَلِدْ وَلمْ یُوْلَدْ۔ وَلَمْ یَکُنْ لَّہٗ کُفُوًااَحَدٌ۔} … Say: He is Allah, the One. Allah, the Self-Sufficient. He neither begets nor is born, and there is none comparable to Him.