As-Salaam alaikum,

Muraqabah is knowing that Allah Ta'ala is watching over us at all times. Allah Subhanahu Wa Ta'ala says:--

"AND KNOW THAT ALLAH KNOWS WHAT IS IN YOUR MINDS, SO FEAR HIM." (2:235)

"AND ALLAH IS EVER A WATCHER OVER ALL THINGS". (33:52)

"AND HE IS WITH YOU WHEREVER YOU MAY BE." (57:4)

In the Hadith of Jibril, peace be upon him, when he asked the Prophet, Sallallahu alaihi Wasallam, about IHSAN (goodness and excellence), the Prophet replied:

"Ihsan is to worship Allah as if you see Him, but since we do not see Him, we
should know that He sees us at all times." (Bukhari and Muslim)

The meaning of this is the definition of Muraqabah, namely, the endurance of the servant's knowledge and his conviction and certainty that Allah is watching over his/her internal and external affairs [ thoughts and actions ]. To have this knowledge and certainty at all times is called MURAQABAH. It is the fruit of the servant's knowledge that Allah is his Watcher, Over-Seeing him, Hearing his utterances and Observing all his deeds at all times.

ALLAHU AKBAR!! ALHAMDU-LILLAHI RABBIL ALAMEEN.