Matthew 12:39–40

39 He answered them,aa “An evil and adulterous generation demands a sign, but no sign will be given to it except the sign of the prophet Jonah.ab 40 For as Jonah was in the belly of the huge fish* ac three days and three nights,ad so the Son of Man will be in the heart of the earth three days and three nights.

aa	Mk 8:11–12 Lk 11:29–32
ab	Is 57:3 Mt 16:4 Mk 8:38
*	Jon 1:17
ac	Jon 1:17
ad	Jon 1:17