Here are the lines in question from the poem, beginning with the third line:
And the forsaken upland hermitage (3)
That held as much as he should ever know
On earth again of home, paused warily.
The road was his with not a native near;
And Eben, having leisure, said aloud,
Since alliteration is the repetition of the beginning consonant sounds of words, line 6 features the most alliteration, with three words alliterating the sound of the consonant "n": "not," "native," and "near." (The runner-up is line 4 with two words, "held" and "he," alliterating the consonant sound of the letter "h".