Fine feathers mak fine birds.
Fine to fine maks a bad line.
Or, "[Butter to butter's nae kitchen]," q. v.
Fire and water are gude servants but ill maisters.
Fire is gude for the fireside.
All things are good in their proper places.
First come, first ser'd.
Fish guts an' stinkin' herrin' are bread and milk for an Eyemouth bairn.
"The small seaport town of Eyemouth was formerly distinguished for its 'ancient fishlike smells,' its narrow, intricate streets, and smuggling trade."—G. Henderson.
Fish maun soom thrice.