Arabic media reports that he wrote on his Facebook page:
Ending the division [between Hamas and Fatah] is a duty. If ending the division does not end the coup, then ending the coup is a duty, and if an end to the coup means ending the Hamas takeover of Gaza, then ending the Hamas takeover of Gaza is a duty, and an end to the Hamas takeover of Gaza is accomplished by only one of two things: either a reconciliation with Hamas or a revolution against it, then one of these two things is a duty.
I couldn't find the original on what I believe is his Facebook page, but the article included an apparent screenshot.
Meanwhile, Hamas hacked the Facebook page of a Fatah radio station.
Unity!