John Gill Commentary 2 Samuel 19:39

"And all the people went over the Jordan, and the king went over: and the king kissed Barzillai, and blessed him; and he returned unto his own place." — 2 Samuel 19:39 (ASV)

And all the people went over Jordan
That were with David:

and when the king was come over ;
over Jordan, had got to the other side of it, whither Barzillai accompanied him:

the king kissed Barzillai, and blessed him ;
took his leave of him with a kiss, as friends were wont to do at parting, thanked him for all his favours, wished him well, and prayed to God to bless him with all blessings temporal and spiritual:

and he returned to his own place :
his own city Rogelim, having crossed over again the river Jordan.