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Abraham did not get his wealth by preaching. Ditto Solomon.

Yes you are absolutely correct but they were both very powerful men of GOD. Does not it stand to reason that they may have had just a little influence over those people in their lives they touched to know the power and glory of loving and obeying GOD? ie just because they were not listed as preachers doesn't mean they did not preach. I have no doubt that Abraham taught his household about GOD, including his child and grandchildren. It also stands to reason that Solomon did the same, especially given that he wrote the book of Proverbs.