Talmud Bavli Yoma on the Cherubim in the Temple

"Rav Ketina said: When the people of Israel would ascend to the Temple on the festival, the Kohanim would roll up the Curtain for them, and show them the Cherubim which were joined together in loving embrace. The Kohanim would tell the people, 'Behold! You are loved by the Omnipresent, just as the love between male and female.'"

-- Talmud Bavli, Yoma 54a