'Swear' in the Bible

You shall fear [only] the Lord your God; and you shall serve Him [with awe-filled reverence and profound respect] and swear [oaths] by His name [alone].

You shall fear [and worship] the Lord your God [with awe-filled reverence and profound respect]; you shall serve Him and cling to Him [hold tightly to Him, be united with Him], and you shall swear [oaths] by His name.

‘Indeed, I lift up My hand to heaven,And say (swear an oath), as I live forever,