(Ar-Room) 30 : 21
وَمِنْ آيَاتِهِ أَنْ خَلَقَ لَكُمْ مِنْ أَنْفُسِكُمْ أَزْوَاجًا لِتَسْكُنُوا إِلَيْهَا وَجَعَلَ بَيْنَكُمْ مَوَدَّةً وَرَحْمَةً ۚ إِنَّ فِي ذَٰلِكَ لَآيَاتٍ لِقَوْمٍ يَتَفَكَّرُونَ
And of His Signs is that He created for you from yourselves mates that you may find tranquility in them, and He placed between you affection and mercy; indeed, in it are signs for people who meditate and reflect.
See explanation 7: 189; 13: 3 and 25: 54.