The hearts ingagement: : a sermon preached at St. Margarets Westminster, at the publique entering into the covenant, by 1. Some of the nobilitie, knighthood, and gentry. 2. Divers colonels, officers, and souldiers. 3. Those of the Scotish nation about the citie. 4. Many reverend divines here residing. Septem. 29. Anno 1643. /