There is one and there is another.
This matter is for us and that matter is for them. By analogy: this is our custom and that is their custom (literally from Aramaic: this is for us and that is for them).
("Halachah: He marries a wife and then studies Torah. Rabbi Yochanan said: He will be merciful in his ways and will engage in Torah? And not a philistine: "Here it is, and here it is for him" - Kiddushin 29b, and so: "And the simple readers are astonished and say: Our books are so twisted... In all this, this and that are the words of the living God and it is not difficult - Here it is...and here it is for him" - Berdichevski/ Letters, 2, 18)
Translation
Expression (Hebrew)
הָא לַן וְהָא לְהוּ
Definition (Hebrew)
הַדָּבָר הַזֶּה עֲבוּרֵנוּ וְהַדָּבָר הַהוּא עֲבוּרָם. בְּהַשְׁאָלָה: זֶה הַמִּנְהָג שֶׁלָּנוּ וְזֶה הַמִּנְהָג שֶׁלָּהֶם (מִלּוּלִית מֵאֲרַמִּית: זֶה לָנוּ וְזֶה לָהֶם).
("הֲלָכָה: נוֹשֵׂא אִשָּׁה ואח"כ יִלְמֹד תּוֹרָה. ר' יוֹחָנָן אָמַר: רֵחַיִם בְּצַוָּארוֹ וְיַעֲסֹק בַּתּוֹרָה? וְלֹא פְּלִיגֵי: הָא לָן, וְהָא לְהוֹ"- קִדּוּשִׁין כט ע"ב, וְכֵן:"וְהַקּוֹרְאִים הַפְּשׁוּטִים תְּמֵהִים וְאוֹמְרִים: סְפָרֵינוּ הֲפַכְפַּכִּים הֵמָּה...בְּכָל זֹאת אֵלּוּ וָאֵלּוּ דִּבְרֵי אֱלֹהִים חַיִּים וְלֹא קָשֶׁה- הָא לָן...וְהָא לְהוֹ"- בֶּרְדִּיצֶ'בְסְקִי/ כְּתָבִים, ב, 18)