True Zikr is to fulfil the Command of Allah Ta’ala which is directed to us at a particular time – to perform Salaah in its respective time, to pay Zakaah when due, to fast during the month of Ramadaan, to perform Hajj at the time of Hajj (if one has the means), etc.
When a person’s parent, wife, child, neighbour, etc. is very ill and requires medication to be brought from the chemist, as a matter of urgency, then at that time, true Zikr is to postpone all optional Ibaadah and attend to the need.
Hazrat Ruqayya (RA), the beloved daughter of Rasulullah (Sallallaahu ‘alayhi wasallam), was very ill when the call for Badr was suddenly made. Since there were only 313 companions accompanying Rasulullah (Sallallaahu ‘alayhi wasallam), there was a definite need for Hazrat Uthman (RA), the husband of Hazrat Ruqayya (Sallallaahu ‘alayhi wasallam), to also join the expedition. However, Rasulullah (Sallallaahu ‘alayhi wasallam) left him behind to care for his wife during her severe illness.
True Zikrullah is the fulfillment of the Commands of Allah Ta’ala and Rasulullah (Sallallaahu ‘alayhi wasallam)