וְנֵ֤ר אֱלֹהִים֙ טֶ֣רֶם יִכְבֶּ֔ה וּשְׁמוּאֵ֖ל שֹׁכֵ֑ב בְּהֵיכַ֣ל יְהוָ֔ה אֲשֶׁר־שָׁ֖ם אֲר֥וֹן אֱלֹהִֽים׃ (פ)
and the lamp of God was not yet gone out, and Samuel was laid down to sleep in the temple of the LORD, where the ark of God was,
Read kabbalistic (mystical) interpretation of I Samuel 3:3: and classical mystical sources.