It was
narrated from ‘Abdullah that the Messenger of Allah (ﷺ)
said:
“Whoever sends fourth three of his children who had not reached
the
age of puberty, they will be a strong fortification for him
against
the Fire.” Abu Dharr said: “I sent forth two.” He said: “And
two” Ubayy bin Ka’b, the chief of the reciters, said: “I sent
forth
one.” He said: “Even one.”