Final answer:
The poetic device present in the bolded words 'break, blow, burn' from John Donne's poem is alliteration.
Step-by-step explanation:
In the stanza from "Batter my heart, three-person'd God" by John Donne, the poetic device found in the bolded words 'break, blow, burn' is alliteration, which is the repetition of the same initial consonant sounds in a series of words. This device adds a rhythmical and emphatic effect to the poem, enhancing its emotional intensity. Alliteration is only one aspect of Donne's use of sound, but it's a significant one that contributes to the poem's powerful prayerful plea.