וַיֵּ֨לֶךְ הַמֶּ֤לֶךְ גִּבְעֹ֙נָה֙ לִזְבֹּ֣חַ שָׁ֔ם כִּ֥י הִ֖יא הַבָּמָ֣ה הַגְּדוֹלָ֑ה אֶ֤לֶף עֹלוֹת֙ יַעֲלֶ֣ה שְׁלֹמֹ֔ה עַ֖ל הַמִּזְבֵּ֥חַ הַהֽוּא׃
And the king went to Gibeon to sacrifice there; for that was the great high place; a thousand burnt-offerings did Solomon offer upon that altar.
Read Kabbalistic (mystical) interpretations of I Kings 3:4: Zohar and classical Jewish mystical sources, free online.