10 Do not leave any of it till morning; if some is left till morning, you must burn it.

Read Exodus 12:10 Using Other Translations

And ye shall let nothing of it remain until the morning; and that which remaineth of it until the morning ye shall burn with fire.
And you shall let none of it remain until the morning; anything that remains until the morning you shall burn.
Do not leave any of it until the next morning. Burn whatever is not eaten before morning.