Kissing was a customary ancient Near Eastern sign of familial love, goodwill, and friendship used in greetings, farewells, and blessings (see Genesis 29:13; Genesis 31:28; Genesis 33:4; Exodus 4:27; Ruth 1:9; 1 Samuel 10:1; 2 Samuel 14:33; Acts 20:37). Kissing and weeping is also reminiscent of Joseph’s reunion with his brothers (Genesis 45:14–15).1
41 And as soon as the boy had gone, David rose from beside the stone heap and fell on his face to the ground and bowed three times. And they kissed one another and wept with one another, David weeping the most.