Azizi, neither one. All verses end with 'over me, over me!' The refrain is the one ending 'be saved.'

For clarity, here is the whole text From Barton:

BEFORE I'D BE A SLAVE
Refrain.
Before I be a slave,
I'd be buried in my grave,
And go home to my Lord and be saved.
1.
O, what preachin'! O, what preachin'!
O, what preachin' over me, over me!
2.
O, what mourning, etc.
3.
O, what singing, etc.
4.
O, what shouting, etc.
5.
O, weeping Mary, etc.
6.
Doubting Thomas, etc.
7.
O, what sighing, etc.

Barton, a D. D., remarked, in his first article, "Old Plantation Hymns," "Conspicuous among the religious songs of the colored people, as of the white people in the Cumberland Mountains, is the large group of "Family Songs," in which the chief or only variation in the successive stanzas is the substitution of "father," "mother," or other relative in order. He gives as a prime example the greeting hymn, "Howdy, Howdy!"