The Ultimate knowledge about Allah is to absolutely have a firm belief that Allah exists without a manner of being and without a place.

Imam Ahmad Ar-Rifa^I said:

قَالُ الشيخُ أَحْمَدُ الرِّفَاعِيُّ “غَايةُ الْمَعْرِفَةِ باللهِ الإِيْقَانُ بِوُجُودِهِ تعالَى بلا كَيْفٍ ولا مَكَانٍ“

The Ultimate knowledge about Allah is to absolutely have a firm belief that Allah exists without a manner of being and without a place.

This means that knowing about Allah is to have the firm conviction that Allah is not a thin body like air and soul and wind and is not a dense body like human beings and stones and trees. He is not a small body like a mustard seed nor a large body like Al-^arsh (the ceiling of Paradise) nor a body in between. Rather the created things are attributed with big and small bodies whether thin or dense.

The largest of all creations is Al-^arsh and it is the Ka^bah for the angels around Al ^arsh to circumambulate similar to the Ka^bah on earth for us to circumambulate.