The ax laid to the root, or, One blow more at the foundation of infant baptism, and church-membership. containing an exposition of that metaphorical text of Holy Scripture, Mat. 3. 10. : being the substance of two sermons lately preached, with some additions, wherein is shewed that God made a two-fold covenant with Abraham, and that circumcision appertained not to the covenant of grace, but to the legal and external covenant God made with Abraham's natural seed, as such : together with an answer to Mr. John Flavel's last grand arguments in his Vindiciarum Vindex, in his last reply to Mr. Philip Cary, also to Mr. Rothwell's Pædo-baptisms vindicatur, as to what seems most material / Part I :