The Sign of Allah in the progressive creation of Man from Clay then from Nutfah and thereafter

Allah tells us how He initially created man from an extract of Tin. This was Adam, peace be upon him, whom Allah created from sounding clay of altered black smooth mud. Ibn Jarir said, "Adam was called Tin because he was created from it." Qatadah said, "Adam was created from Tin." This is the more apparent meaning and is closer to the context, for Adam, upon him be peace, was created from a sticky Tin, which is a sounding clay of altered black smooth mud, and that is created from dust, as Allah says:

وَمِنْ ءَايَـتِهِ أَنْ خَلَقَكُمْ مِّن تُرَابٍ ثُمَّ إِذَآ أَنتُمْ بَشَرٌ تَنتَشِرُونَ

(an extract of clay) which changes into the seed ثُمَّ جَعَلْنَاهُ نُطْفَةً (then We made him a sperm-drop). Now it is well known that the production of food from the earth, its absorption in the human body of that special element which changes into the seed is a long drawn out process. Similarly the third stage of the transformation from the sperm-drop نُّطْفَةَ to clot مُضْغَةَ takes a long time to materialize and has been described by the Qur'an in the words ثُمَّ خَلَقْنَا النُّطْفَةَ عَلَقَةً (then We made the sperm-drop into a clot - 23:14 ). The next three stages, i.e. from عَلَقَةً (clot) to مُضْغَةَ (foetus-lump), from to bones, and thirdly clothing flesh on bones occurring in short periods is not too remote a possibility, and in describing these three changes the particle فَ has been used which, as has been explained earlier, is indicative of uninterrupted succession. The final change in the condition of the unborn child comes when life and soul are breathed into it. And since, according to human reckoning, putting life and soul into a lifeless mass must necessarily take a long time, therefore, here again the word ثُم has been used to describe this final stage of transformation.

The final stage in human creation, i.e. putting life and soul into it