'Grain Offering' in the Bible

So Manoah took a kid with a grain offering, and offered it upon a rock unto the LORD: and the angel did a wondrous thing; and Manoah and his wife looked on.

But his wife said unto him, If the LORD were pleased to kill us, he would not have received a burnt offering and a grain offering at our hands, neither would he have showed us all these things, nor would at this time have told us such things as these.