He sent from above, &c.— This may either denote, in general, that God aided and assisted him by his divine power, or that he sent his angels from heaven, to protect and rescue him from the many dangers that surrounded him; which he figuratively calls drawing him out of many waters; afflictions and great calamities being frequently represented by deep waters and floods in the sacred writings. See Chandler, and Lowth's 6th Prelection. Theodoret observes, that the Psalmist tells us what waters he means by the next words: He delivered me from my strong enemies; i.e. from Saul and other his persecutors.
Related Commentaries of Psalms 18:16
Psalms 18:16
16 He sent from above, he took me, he drew me out of manye waters.