Foul water slockens fire.
Frae saving comes having.
Frae the teeth forward.
He speaks from the lips only, not from the heart.
Freedom's a fair thing.
Fresh fish and poor friends soon grow ill-faur'd.
Fresh fish and unwelcome friends stink before they're three days auld.
Friday flit, short time sit.
Meaning that to remove on a Friday is unlucky.
Friday rules Sunday.