Imam Zayn al-Din ibn Rajab al-Hanbali (d.795AH) mentions the following regarding Allah’s Nuzul within his Fath al-Bari* – his Commentary upon Sahih al-Bukhari:
“What is meant by it is that His Nuzul (lit. descent) is not (in terms of) spatial movement from (one) place to (another) place, like the descent (Nuzul) of created things.”
[Fath al-Bari Sharh Sahih al-Bukhari of ibn Rajab al-Hanbali, chapter on facing towards the direction of the Qibla]
*Not to be confused with the Fath al-Bari of Shaykh al-Islam ibn Hajar al-’Asqalani (d.825AH) – also a commentary on Sahih al-Bukhari. Incidentally, Imam ibn Rajab al-Hanbali’s commentary is only partial as he did not have the opportunity to complete it during his lifetime.
وقال ابن رجب الحنبلي رحمه الله: ومراده أن نزوله ليس هو انتقال من مكان إلى مكان كنزول المخلوقين