Ne'er rax abune your reach.
That is, do not exert yourself beyond your strength.
Ne'er say gae, but gang.
Ne'er say "Ill fallow" to him you deal wi'.
Ne'er shaw me the meat, but the man.
"If a man be fat, plump, and in good liking, I shall not ask what keeping he has had."—Kelly.
Ne'er shaw your teeth unless ye can bite.
Ne'er speak ill o' the deil.
Ne'er speak ill o' them whase bread ye eat.
Ne'er spend gude siller looking for bad.