Tafsir of Nuh 71:25

Allah says,

مما خطيياتهم

Because of their sins, It also has been recited as;

خطاياهم

(their errors.)

أغرقوا

they were drowned, meaning, for their numerous sins, rebellion, persistence in disbelief and opposition to their Messengers.

أغرقوا فٲدخلوا نارا

they were drowned, then were made to enter the Fire. meaning, they will be carried from the flood of the seas to the heat of the Fire.

فلم يجدوا لهم من دون الله أنصارا

And they found none to help them instead of Allah. meaning, they will have no helper, assistant, or savior who can rescue them from the punishment of Allah. This is similar to Allah's statement,

ﻻ عاصم اليوم من أمر الله إﻻ من رحم

This day there is no savior from the decree of Allah except him on whom He has mercy. (11:43)

وقال نوح رب ﻻ تذر على اﻻرض من الكافرين ديارا