NT-EPISTLES.filter - kjv swear:

kjv@Hebrews:6:13 @ For when God made promise to Abraham, because he could swear by no greater, he sware by himself,

kjv@Hebrews:6:16 @ For men verily swear by the greater: and an oath for confirmation is to them an end of all strife.

kjv@James:5:12 @ But above all things, my brethren, swear not, neither by heaven, neither by the earth, neither by any other oath: but let your yea be yea; and your nay, nay; lest ye fall into condemnation.