The order of worship in a Teravada Buddhist temple is first the 'Chathya' containing the holy relics. Next the sacred 'Bo' Tree under which the Sakyamuni attained Buddhahood and lastly the statue of Lord Buddha.
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The 'Chaithya' - 'Saaririka'
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The sacred 'Bo Tree' - 'Paaribhogika'
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The image representing Lord Buddha - 'Uddhesika'