When joining the collective, members were required to swear allegiance to bin Laden personally, not to al Qaeda as a group.
The Cardinals were also required to swear an oath of fidelity to “Blessed Peter in the person of the Supreme Pontiff.”
I cling to my family members for support—my brothers-in-law and nephews who swear to me that they love Sex and the City.
Watching it, you could swear you were 200 feet under the ocean, stuck in this rusty tomato can.
I swear Rick Santorum grows ever more adorable with each passing week.
And, by all the saints, I swear you are the only woman I have ever loved!
He was then required to swear by all the gods, and by the dreaded Erinnys, that he had spoken truly.
swear to me that you will not injure the child, or I will not bring it to you.
He tried to swear Edith and me to secrecy, but we refused to be sworn.
I swear that I have no thought beyond the interest of my country.
Old English swerian "take an oath" (class VI strong verb; past tense swor, past participle sworen), from Proto-Germanic *swarjan-, (cf. Old Saxon swerian, Old Norse sverja, Danish sverge, Old Frisian swera, Middle Dutch swaren, Old High German swerien, German schwören, Gothic swaren "to swear"), from PIE root *swer- (1) "to speak, talk, say" (cf. Old Church Slavonic svara "quarrel"). Also related to the second element in answer. The secondary sense of "use bad language" (early 15c.) developed from the notion of "invoke sacred names." Swear-word is American English colloquial from 1883. Swear off "desist as with a vow" is from 1898.