Bismillah hir Rahman Nir Raheem
Muraqabah is knowing that Allah is watching over us. 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] There are many other similar verses stating the same concept.
In the hadith of Jibreel, when he asked the Prophet (s) about ihsan (goodness and excellence), the Prophet (s) 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 hadith is the definition of muraqabah. Namely, the endurance of the servant's knowledge and his conviction and certainty that Allah is watching over his internal and external affairs. 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 of his deeds at all times.
The one firm in muraqabah fears the waste of even a moment for other than his Lord." Dhun-Nun said: "The sign of muraqabah is to favor what Allah has sent down (of the revelation), to glorify what Allah has glorified, and to despise what Allah has despised.
Ibrahim Al-Khawass said:
Muraqabah is the sincerity of both the internal and external to Allah.
It has been said that"
The best that man may cling to on this road to Allah is muhasabah(reckoning of the self), muraqabah, and governing his conduct with knowledge.