(Musa) said;"Our Lord is He Who gave to each thing its form and nature, then guided it aright."
Ali bin Abi Talhah related that Ibn Abbas said,
"He is saying that He created a mate for everything."
Ad-Dahhak said that Ibn Abbas said,
"He made the man a man, and the donkey a donkey and the sheep a sheep."
Layth bin Abi Sulaym reported from Mujahid that he said,
"He gave everything its form."
Ibn Abi Najih said that Mujahid said,
"He fashioned the creation of every moving creature."
Sa`id bin Jubayr said concerning His statement,
أَعْطَى كُلَّ شَيْءٍ خَلْقَهُ ثُمَّ هَدَى
((Who) gave to each thing its form and nature, then guided it aright),
"He gave each of His creatures what is suitable for its creation."
Therefore, He did not give man the form of a wild beast, nor did He give wild beasts the form of the dog. Likewise, the dog's form is not like the sheep's. He also gave creature a suitable spouse, and He influenced everything towards that mate. There is no species of creation that is exactly like another species. They are different in their actions, their forms, their sustenance and their mating.
Some of the scholars of Tafsir have said that this statement, "He gave to each thing its form and nature, then guided it aright," is similar to Allah's statement,
وَالَّذِى قَدَّرَ فَهَدَى
And Who has measured; and then guided. (87;3)
This means He measured out an ordained amount (of sustenance, actions, etc.) and then guided His creatures to it. He wrote the deeds, the appointed times of death and the provisions. Then, the creatures traverse upon that and they are not able to avoid it, nor are they able to abandon it.
In this Ayah Musa is saying that our Lord is the One Who created the creation, measured out its ordainment and compelled the creatures to that which He wanted.
قَالَ فَمَا بَالُ الْقُرُونِ الاْاُولَى