'Mercy seat' in the Bible

yea, Jehovah saith unto Moses, 'Speak unto Aaron thy brother, and he cometh not in at all times unto the sanctuary within the vail, unto the front of the mercy-seat, which is upon the ark, and he dieth not, for in a cloud I am seen upon the mercy-seat.

and he hath put the perfume on the fire before Jehovah, and the cloud of the perfume hath covered the mercy-seat which is on the testimony, and he dieth not.

'And he hath taken of the blood of the bullock, and hath sprinkled with his finger on the front of the mercy-seat eastward; even at the front of the mercy-seat he doth sprinkle seven times of the blood with his finger.

And he hath slaughtered the goat of the sin-offering which is the people's, and hath brought in its blood unto the inside of the vail, and hath done with its blood as he hath done with the blood of the bullock, and hath sprinkled it on the mercy-seat, and at the front of the mercy-seat,