Some links you may find helpful:
Dr. Russell Kelly on tithing: Tithing — Russell Kelly
Dr. John MacArthur discusses the widow’s two coins story: Abusing the Poor
Online Bible study suite: Bible Hub
Faithful Abstractions
Issues of the Christian faith
Some links you may find helpful:
Dr. Russell Kelly on tithing: Tithing — Russell Kelly
Dr. John MacArthur discusses the widow’s two coins story: Abusing the Poor
Online Bible study suite: Bible Hub
Faithful Abstractions 
I also find the Blue Letter Bible to be an excellent study Bible resource: http://blb.org/.
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