Surah Fussilat Tafseer

وَجَعَلَ فِيهَا رَوَاسِيَ مِن فَوْقِهَا وَبَارَكَ فِيهَا

He placed therein firm mountains from above it, and He blessed it,

means, He blessed it and gave it the potential to be planted with seeds and bring forth produce.

وَقَدَّرَ فِيهَا أَقْوَاتَهَا

And measured therein its sustenance,

means, what its people need of provision and places in which to plant things and grow crops.

This was on Tuesday and Wednesday, which together with the two previous days add up to four days.

فِي أَرْبَعَةِ أَيَّامٍ سَوَاء لِّلسَّايِلِينَ

in four Days equal for all those who ask.

meaning, for those who want to ask about that, so that they might know.

Ikrimah and Mujahid said concerning the Ayah:

وَقَدَّرَ فِيهَا أَقْوَاتَهَا

(and measured therein its sustenance):

"He placed in every land that which is not suited for any other land."

Ibn Abbas, Qatadah and As-Suddi said, concerning the Ayah,

(equal for all those who ask):

this means, "For whoever wants to ask about that."

Ibn Zayd said:

(and measured therein its sustenance in four Days equal for all those who ask).

"According to whatever a person who is need of provision wants, Allah measures out for him what he needs."

This is like what they said concerning the Ayah:

وَاتَاكُم مِّن كُلِّ مَا سَأَلْتُمُوهُ

And He gave you of all that you asked for, (14:34)

And Allah knows best