Matthew Poole and continuators on Luke 17:16

16 And fell down on his face at his feet, giving him thanks: And he was a Samaritane.

It is most probable that this Leper first shewed himself to the Priest, according to the Commandment and the direction of our Saviour, and then returned to give our Saviour thanks. Some think that this glorifying God here mentioned, and his giving thanks to Christ, signifie the same thing▪ I doubt it, because nothing appeareth from this Story sufficient to convince us, that he looked upon Christ as God; nay it doth not appear that his Faith was risen so high as to believe him, the Messiah, the Son of David, they speak to him only under the notion of Iesus, Master, v. 13. It is plain they believed him at least to be a great Prophet, sent from God, and cloathed with a Power from God. I chuse rather therefore to Interprete his falling down on his face at his Feet, as an humble posture of Reverence, which those Nations did often use to complement their Superiours by, even as a posture of Adoration, and that his glorifying God, was a praising of him as the principal efficient cause of his healing, and his giving thanks to Christ, a civil respect paid to Christ as Gods instrument in the case. The Evangelist addeth, and he was a Samaritane. Christ calls him a Stranger, v. 18. A Stranger to the Common-Wealth of Israel, as all the Samaritanes were.