Allah, subhana wa ta ala, says in the Qur'an, the translation of which is:
"And indeed We created man (Adam) out of an extract of clay. Thereafter We made him (his offspring) as a Nutfah (mixed drops of male and female discharge) in a safe lodging (the mother's womb). Then We made the Nutfah into a clot, then We made the clot into a little lump of flesh, then We made out of that little lump of flesh bones, then We clothed the bones with flesh, and then We brought it forth as another creation. So Blessed is Allah, the Best of Creators. After that, you will surely die. Then, surely you will be resurrected on the Day of Resurrection."
--Surah Al-Mu'minun, Ayahs 12-16