Ne'er marry a penniless maiden that's proud o' her pedigree.
Ne'er marry a widow unless her first man was hanged.
Ne'er misca' a Gordon in the raws o' Stra'bogie.
The Gordons were the ruling clan in Strathbogie; and the proverb means that we should never speak ill of a man on his own property.
Ne'er put your arm out farther than you can draw it easily back again.
"The deacon used to say to me, 'Nick—young Nick' (his name was Nicol as well as mine, sae folk ca'd us, in their daffin, young Nick and auld Nick)—'Nick,' said he, 'never put out your arm farther than ye can draw it easily back again.'"—Rob Roy.
Ne'er ower auld to learn.
Ne'er put a sword in a wudman's hand.
Ne'er put the plough before the owsen.
Ne'er quit certainty for hope.