oath; vow; to swear; to pledge

to pledge one's life

oath; vow; pledge; promise

oath; pledge

to vow before one's troops

to abjure; to swear to quit

the two cannot exist together (idiom); irreconcilable differences; incompatible standpoints

to vow not to break one's promise

to vow to die rather than obey (idiom)

to vow to fight to the death