In surat al-Qassas a long passage tells us the story of Musa (). In the part telling what happened after reaching Madyan, we learn that he married one of the daughters of the old man under the condition to fulfill either a term of 8 years or 10 years. But the story no where tells us which of both he has achieved. Allah the Almighty says:
He said, "Indeed, I wish to wed you one of these, my two daughters, on [the condition] that you serve me for eight years; but if you complete ten, it will be [as a favor] from you. And I do not wish to put you in difficulty. You will find me, if Allah wills, from among the righteous." (27)
[Moses] said, "That is [established] between me and you. Whichever of the two terms I complete - there is no injustice to me, and Allah , over what we say, is Witness." (28)
And when Moses had completed the term and was traveling with his family, he perceived from the direction of the mount a fire. He said to his family, "Stay here; indeed, I have perceived a fire. Perhaps I will bring you from there [some] information or burning wood from the fire that you may warm yourselves." (28:27-29)
Do we know at the end which of these terms Musa could fulfill?