ما وجه النصب في كلمة "أسفل" في الآية الكريمة "إذ جاؤوكم من فوقكم ومن أسفل منكم"؟

The Almighty's saying, "and from what is beneath you," the fatḥah in it is not for the accusative case (naṣb), but rather it is a sign for the genitive case (jarr); because the word "أَسْفَل" (asfal) is a diptote (prevented from full declension) due to its adjectival nature and the وزن أفعل (afʿal pattern), so it is put in the genitive case with a fatḥah as a substitute for a kasrah.