He 'devoted' [='dedicated'] his life/time 'to' helping the poor. = He 'devoted himself to' helping the poor. [=he used his time, energy, etc., to help the poor]
The author's 'devoted' [='loyal, faithful'] readers have been eagerly waiting for the new book.
Some of the money they raise will be 'devoted to' repairing the church's roof.
(..) I'd miss the alps. You'll miss 'em either way. And there's no family in the picture, is there? Not a wife Or children? So you've devoted your entire life To an institution that's now turning its back on you. The last illusion Of the illusionless man. (..)2015 TvShow: Homeland Title: A False Glimmer Season: 5 Episode 12