The complete 3-part study with Psalm 41 is now available here 

Part 1: “Psa 41:1-5 “Our “bed of languishing” Part I”
Part 2: “Psa 41:1-5 “Our “bed of languishing” Part II”
Part 3: “Psa 41:6-13 ‘Judgement upon the house of God, where the man of perdition resides”