Cast not forth the old water while the new come in.
More Scottish Proverbs:
As the old Cock craws, the young Cock lears.Scottish
Goe shoe the Geese.
Scottish
Married folk are like rats in a trap -- fain to get others in, but fain to be out themselves.
Scottish
He rides sicker that fell never.
Scottish
I shall hold his Nose to the Grindstone.
Scottish
I have seen as light a green.
Scottish