This Explains:
Importance of worshiping at home, especially at times when the Muslims are in a position of weakness.
In this context we may think of the mihraab of Maryam, which was her place of worship, as Allah says (interpretation of the meaning):
“…
Every time Zakariya entered the mihraab to visit her, he found her supplied with sustenance…”
[Aal ‘Imraan 3:37]