What is the ruling on using the verse: (And We have made a barrier in front of them and a barrier behind them and covered them, so they do not see) by changing the word (فهم - then they) to (وهم - and they) with the intention of supplication or remembrance, and was this verse mentioned as a form of remembrance by the Prophet, may Allah’s prayers and peace be upon him?

What aligns with the wording of the Quran without the intention of quoting it as part of it is called "Iqtibas" (allusion or borrowing), and it is permissible under certain conditions. There is no harm in writing something that aligns with the wording of a verse, even with a slight change, as long as it is not intended to be from the Quran. However, it is preferable to mention it without alteration to avoid confusion. It has not been reported from the Prophet, peace and blessings be upon him, that he recited this verse as part of the adhkar (remembrances).