“The
Messenger of Allah (ﷺ) said: ‘The night prayers are (to be
offered)
two by two. Say the Tashah-hud after each two Rak`ah, and
raise your
hands in all humility like one who is poor and needy and
say:
‘Allāhummaghfir lī (O Allah, forgive me).’ And whoever does
not do
that, it is imperfect.’”
Sunan Ibn Majah Book 5, Hadith 523