And all things We have created by pairs) in the earth, (that haply ye may reflect) on the creation of Allah.
- 51:4949
وَمِنْ كُلِّ شَيْءٍ خَلَقْنَا زَوْجَيْنِ لَعَلَّكُمْ تَذَكَّرُونَ
And We created pairs of everything that you may contemplate.
- common.revelation-Meccan
- common.hizb : 209