While Erica and Tina Campbell may have voices sent from heaven, fans of WEtv series Mary Mary know there were times when their sisterly bond was anything but harmonious.

After five seasons of laughter, love, pain and triumph, the gospel faves are going out with a bang, wrapping up the hit reality series with an explosive sixth season that will test their loyalty to one another and even their faith.

In this exclusive clip, it’s clear that tensions between Erica and Tina are mounting as they prepare to drop competing solo singles while rehearsing for a joint show.

While Tina struggles to find her note, Erica’s vocals soar, causing a few side-eyes between them and, ultimately, a walk out.

Check out the clip below

Mary Mary airs tonight, Oct. 5, at 9 p.m. on WEtv.