{Peter began to say} ((8872)xato legein ho Petros). It was
hard for Peter to hold in till now.  Mt 19:27  says that "Peter
answered" as if the remark was addressed to him in particular. At
any rate Peter reminds Jesus of what they had left to follow him,
four of them that day by the sea ( Mr 1:20  Mt 4:22  Lu 5:11 ).
It was to claim obedience to this high ideal on their part in
contrast with the conduct of the rich young ruler.