If the covenant of Christ only permits men to call God "Father" (Galatians 4:5, Ephesians 1:5) - How can the prophet Isaiah call YHVH "Father" under Mosaic Law?
[Yeshayahu יְשַׁעְיָ֣הוּ | Isaiah 63:16] "For You are our father, for Avraham did not know us, neither did Yisrael recognize us; You, YHVH, are our Father; our redeemer of old is your name." (כִּֽי־אַתָּ֣ה אָבִ֔ינוּ כִּ֚י אַבְרָהָם֙ לֹ֣א יְדָעָ֔נוּ וְיִשְׂרָאֵ֖ל לֹ֣א יַכִּירָ֑נוּ אַתָּ֚ה יְהֹוָה֙ אָבִ֔ינוּ גֹּֽאֲלֵ֥נוּ מֵֽעוֹלָ֖ם שְׁמֶֽךָ)
- Yeshayahu יְשַׁעְיָ֣הוּ never knew Jesus of Nazareth, but recognized יְהֹוָה֙ YHVH as Avinu אָבִ֔ינוּ "Our-Father".
Why was a recognition of Jesus as Christ not required for Israelites like Yeshayahu יְשַׁעְיָ֣הוּ "Isaiah" to call YHVH their Father, under Mosaic Law?