Live upon love, as laverocks do on leeks.
Living at heck and manger.
To live at "heck and manger" is to fare sumptuously every day, even beyond our income.
Lock your door, that you may keep your neighbours honest.
Lo'e me little an' lo'e me lang.
Look before ye loup, ye'll ken better how to light.
"Luke quhair thou licht befoir thou lowp,
And slip na certainty for howp,
Quha gyds thee but begess."
—Cherrie and the Slae.
Loud coos the doo when the hawk's no whistling; loud cheeps the mouse when the cat's no rustling.
That is, subordinates take advantage when superiors are out of the way. "When the cat's away, the mice will play."—English.