I swear on my mother in law (Nishba leha be hamoti.)
Swearing on my mother-in-law means I might cry, yell, or throw something. Probably all three.
I said I’d never wear that shirt again. Nishba leha be hamoti. (I wore it to the funeral.)
He swore on his mom-in-law he’d stop smoking. (He’s still smoking.)
She promised to stop texting me at 2 AM. Nishba leha be hamoti. (She texted me at 2 AM.)