There is justice in his words
Figuratively: he made justified arguments; there are several valid points in what he said.
("The sage R. Abraham, z\"l, mentioned a secret in it, and this is his wording: the word 'mi' is a prefix and the word 'hamarim' is an adjective, but its secret is known, end quote. And I say that he was right in his words, that it is an adjective" — Rabbeinu Bechaye, Numbers 5:18).
Translation
Expression (Hebrew)
יֵשׁ צֶדֶק בִּדְבָרָיו
Definition (Hebrew)
בְּהַשְׁאָלָה: הוּא אָמַר טְעָנוֹת מֻוצְדָּקוֹת. יֶשְׁנָן כַּמָּה טְעָנוֹת צוֹדְקוֹת בִּדְבָרָיו.
("וְהֶחָכָם ר' אַבְרָהָם זַ"ל הִזְכִּיר בּוֹ סוֹד, וְזֶה לְשׁוֹנוֹ: מִלַּת "מִי" סָמוּךְ וּמִלַּת "הַמָּרִים" תֹּאַר הַשֵּׁם, אֲבָל סוֹדוֹ יָדוּעַ, עַד כָּאן. וְאוֹמֵר אֲנִי כִּי צָדַק בִּדְבָרוֹ שֶׁהוּא שֵׁם הַתֹּאַר"- רַבֵּנוּ בְּחַיֵּי בַּמִּדְבָּר ה יח).