Does the saying, "Indeed we belong to Allah, and indeed to Him we shall return. O Allah, reward me in my calamity and compensate me with something better," when recalling a bad event or worry, bring about compensation with good? Is this specific to an actual calamity or does it include remembering it? And how does this compensation occur?

The true patience, for which the reward is magnified, is patience at the first shock of a calamity. This is because the passage of time eases hardships and weakens one's ability to control oneself at the beginning of an incident. Whoever remains patient at that moment demonstrates faith and seeks reward from Allah. As for someone who finds comfort after a while, they do not deserve the title of true patience; rather, they have found comfort just as animals do.

As for the supplication, "Indeed we belong to Allah, and indeed to Him we will return. O Allah, reward me in my calamity and replace it with something better," uttering it at the very first occurrence of a calamity is what the Prophet (peace be upon him) linked to a reward. However, it remains permissible thereafter, especially when remembering the calamity and feeling its intensity. This is a supplication through which one hopes for a response and seeks a good replacement from Allah Almighty, and this replacement may be in both this world and the Hereafter.