Q 1: What is
the Islamic ruling in your opinion on saying these phrases: "Allah knows that...," "Allah forbid!"
"Allah's Will," and "Allah and His Messenger know best"?
There is no harm in saying "Allah knows that..." if the person is saying the truth. There is also no harm in saying "Allah forbid!" if it is said to seek the removal of something that is causing harm. Saying "Allah's Will" is also permissible if it is intended to attribute anything that befalls a person, whether it is illness, poverty, or the like, to Allah's Universal Will and Predestination. As for saying "Allah and His Messenger know best," this was permissible during the lifetime of the Messenger (peace be upon him), but after his death, we should say "Allah knows best," because the Messenger (peace be upon him) does not know what is happening after his death.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.