The Quran

خَلَقَكُم مِن نَفسٍ واحِدَةٍ ثُمَّ جَعَلَ مِنها زَوجَها وَأَنزَلَ لَكُم مِنَ الأَنعامِ ثَمانِيَةَ أَزواجٍ ۚ يَخلُقُكُم في بُطونِ أُمَّهاتِكُم خَلقًا مِن بَعدِ خَلقٍ في ظُلُماتٍ ثَلاثٍ ۚ ذٰلِكُمُ اللَّهُ رَبُّكُم لَهُ المُلكُ ۖ لا إِلٰهَ إِلّا هُوَ ۖ فَأَنّىٰ تُصرَفونَ

Ali Unal

He has created you from a single human self, and then He has made from it its mate;¹ and He has sent down for you eight in pairs of cattle.² He creates you in the wombs of your mothers, one act and phase of creation after another,³ in three veils of darkness.⁴ This is God, your true Lord (Who creates, and sustains you): To Him belongs the sovereignty (absolute ownership and dominion of everything). There is no deity but He. How, then, are you turned about (to different kinds of belief)?

For an explanation, see 4: 1, note 1.
Eight in pairs (see 6: 143–144): two of sheep, two of goats, and, likewise, of camels there are two, and of oxen there are two. The phrase God”has sent them down” means that they are among the bounties of God that He has bestowed out of the treasures He maintains. Elsewhere (15: 21), He states: There is not a thing but the stores (for its life and sustenance) are with Us, and We do not send it down except in due, determined measure.
One act and phase of creation after another, refers to the stages an embryo passes through in the womb. These are explained in 22: 5: Then (We have created you) from a drop of seminal fluid, then from a clot clinging (to the womb wall), then from a lump in part shaped and in part not shaped, and differentiated and undifferentiated; and in 23: 14: Then We have created of the fertilized ovum a clot clinging (to the womb wall), and (afterwards in sequence) We have created of the clinging clot, a (chewed) lump, and We have created of the (chewed) lump bones, and We have clothed the bones in flesh. Then We have caused it to grow into another creation.
Three veils of darkness must be the anterior abdominal wall, the uterine wall, and the amniochorionic membrane. Although there are other interpretations of this statement, the one presented here seems the most logical to modern embryologists from an embryological point of view.