Praying in the musalla when there is a mosque nearby
Question

                In the hospital there are a number of jamaa’ahs (congregations) for the prayer, but there are mosques nearby. Do those who are near them have to go to the mosque or are these jamaa’ahs inside the hospital sufficient?.
Praise be to Allah.This matter is subject to further 
    discussion. 
For those whose presence is required in the 
    hospital, such as guards etc., or for patients who are unable to get to the mosque, they do not have to go out to the mosque; rather they should 
    pray where they are with the jamaa’ah that they are able to pray with. 
But for those who can reach the mosque, they 
    have to do so, in accordance with the shar’i evidence, such as the hadeeth in which the Prophet  (peace and blessings of Allaah be upon him) 
    said: “Whoever hears the call to prayer and does not respond, there is no prayer for him (his prayer is not valid), except for those who have an 
    excuse.” It was said to Ibn ‘Abbaas (may Allaah be pleased with him), What is the excuse? He said, Fear or sickness. (Narrated by Ibn Maajah and 
    al-Daaraqutni; classed as saheeh by Ibn Hibbaan and al-Haakim; its isnaad is saheeh).