וְחָלַ֤ף בִּֽיהוּדָה֙ שָׁטַ֣ף וְעָבַ֔ר עַד־צַוָּ֖אר יַגִּ֑יעַ וְהָיָה֙ מֻטּ֣וֹת כְּנָפָ֔יו מְלֹ֥א רֹֽחַב־אַרְצְךָ֖ עִמָּ֥נוּ אֵֽל׃ (ס)
흘러 유다에 들어와서 창일하고 목에까지 미치리라 임마누엘이여 그의 펴는 날개가 네 땅에 편만하리라 하셨느니라
Tractate Soferim
"Let me tell of the decree" (Psalm 2:7) is holy - but the sages say it's not. "before God אל אלהים in Zion" (Psalm 84:8) the first is not holy, but the second is. "To come before God אל אל in judgement" (Job 34:23) - the first is not holy, bur the second is. "Immanuel עמנו אל" the name (Isaiah 7:14) and "God is with us עמנו אל" the phrase (Isaiah 8:10) - the first is not holy, the second is is holy. The first can be erased, the second cannot be erased.