Revelation 2:14-16
But I have a few things against you, because you have there them that hold the doctrine of Balaam, who taught Balac to cast a stumbling block before the children of Israel, to eat things sacrificed to idols, and to commit fornication.
Nave's Topical Index

The People on the Earth: Chapters 2-3
... Three of the Assemblies are warned with regard to this evil. Ephesus (ii.6); Pergamos
(ii.14, 15); and Thyatira (ii.20). ... Crimination. (Lukewarmness.) f 17, 18. ...
/.../bullinger/commentary on revelation/the people on the earth .htm

Luke-warm

Lukewarmness: Figurative

Lukewarmness: Laodicea

Lukewarmness: Pergamos

Lukewarmness: Sardis

Lukewarmness: The Jews Under Nehemiah

Lukewarmness: The Reubenites, when Deborah Called on Them to Assist Sisera

Lukewarmness: Thyatira

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