Sentence:  For thus, that King violated that Oath which he ought moſt religiouſly to have ſworn to; but that he might not ſeem openly and publickly to violate it, he craftily <WSD>adulterated</WSD> and corrupted it; and leſt he himſelf ſhould be accounted perjur'd, he turn'd the very Oath into a Perjury. ... And who durſt pervert and <WSD>adulterate</WSD> that Law which he thought the only Obſtacle that ſtood in his way, and hindred him from perverting all the reſt of the Laws? 
Meaning of the word marked with <WSD> tags:  To corrupt.