וְלֹא־יָסַ֨ף שְׁמוּאֵ֜ל לִרְא֤וֹת אֶת־שָׁאוּל֙ עַד־י֣וֹם מוֹת֔וֹ כִּֽי־הִתְאַבֵּ֥ל שְׁמוּאֵ֖ל אֶל־שָׁא֑וּל וַיהוָ֣ה נִחָ֔ם כִּֽי־הִמְלִ֥יךְ אֶת־שָׁא֖וּל עַל־יִשְׂרָאֵֽל׃ (פ)
And Samuel never beheld Saul again until the day of his death; for Samuel mourned for Saul; and the LORD repented that He had made Saul king over Israel.
Read Midrashic interpretations of I Samuel 15:35: rabbinic exegesis from Bereshit Rabbah, Shemot Rabbah and classical Midrash sources, free.