sources mekorot - Where do the words sholom bayis come from?

I hear people speak of the need for sholom bayis.

1a) Where do the words come from?

1b) Where does the concept come from?

Answer

וַאֲמַרְתֶּם כֹּה לֶחָי וְאַתָּה שָׁלוֹם וּבֵיתְךָ שָׁלוֹם וְכֹל אֲשֶׁר-לְךָ שָׁלוֹם: - שמואל א כה:ו

"and thus ye shall say: All hail! and peace be both unto thee, and peace be to thy house, and peace be unto all that thou hast." - Samuel 2:25:6

אמר רבא: פשיטא לי נר ביתו ונר חנוכה נר ביתו עדיף משום שלום ביתו; נר ביתו וקידוש היום נר ביתו עדיף משום שלום ביתו...- שבת כג ב

Raba said: It's obvious to me that, between the lamp of the house and the lamp of Hannukah, the lamp of the house is more important because of peace in his home; between the lamp of the house and the sacntification of the day, the lamp of the house is more important because of peace in his home... - Talmud Shabbat 23b