וַיִּקַּ֨ח אַהֲרֹ֜ן אֶת־אֱלִישֶׁ֧בַע בַּת־עַמִּינָדָ֛ב אֲח֥וֹת נַחְשׁ֖וֹן ל֣וֹ לְאִשָּׁ֑ה וַתֵּ֣לֶד ל֗וֹ אֶת־נָדָב֙ וְאֶת־אֲבִיה֔וּא אֶת־אֶלְעָזָ֖ר וְאֶת־אִֽיתָמָֽר׃
I pojął Ahron Eliszebę, córkę Aminadaba, siostrę Nachszona sobie za żonę, i urodziła mu Nadaba, i Abihu, Elazara i Ithamara.
Tze'enah Ure'enah
“Sister of Nahshon” [6:23]. The verse tells us that Aaron married Elisheva, the daughter of Aminadav. Her brother’s name was Nahshon. This teaches us that when somebody wants to marry a wife, one should see what kind of brother she has, since the children take after the wife’s brother.6Rashi, Exodus, 6:23.
Rashi
אחות נחשון THE SISTER OF NAASHON — Hence they (the Rabbis) learned (i.e. from the fact that Scripture states who her brother was when it mentions her marriage to Aaron) that he who is about to take a wife should strictly investigate who her brothers are (Bava Batra 110a).
Chizkuni
ויקח אהרן את אלישבע, Aaron married Elisheva; she is mentioned by name because of the priestly status of her husband. (Compare Nachmanides)