Stay resistant, and stay committed to what you sing, 'cos
They can flip it the minute that you refrain

from Lupe Fiasco – Glory Lyrics on Rap Genius

Meaning

He wants us to stay strong and keep preaching the truth because once we stop, the media (the hypnotists from the previous line) will sway them right back to their side. Refrain has double meaning, to stop (staying committed) and also the refrain in the “song” you sing.

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