´It was narrated from Salamah bin Akwa' that:` He used to pray the Maghrib with the Messenger of Allah when the sun set.
Explanation & Benefits
Maulana Ataullah Sajid
Benefit:
The meaning of "hiding behind the veil (curtain)" is that the disk of the sun completely sets and none of its edge remains visible; that is, the time for Maghrib prayer begins when the sun has fully set.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 688