וַיִּקַּ֨ח אַהֲרֹ֜ן אֶת־אֱלִישֶׁ֧בַע בַּת־עַמִּינָדָ֛ב אֲח֥וֹת נַחְשׁ֖וֹן ל֣וֹ לְאִשָּׁ֑ה וַתֵּ֣לֶד ל֗וֹ אֶת־נָדָב֙ וְאֶת־אֲבִיה֔וּא אֶת־אֶלְעָזָ֖ר וְאֶת־אִֽיתָמָֽר׃
און אַהרן האָט זיך גענומען אֶלישֶבַע די טאָכטער פֿון עַמינָדָבן, די שװעסטער פֿון נַחשוֹנען, פֿאַר אַ װײַב, און זי האָט אים געבאָרן נָדָבן, און אַביהואן, אֶלעָזָרן, און איתָמָרן.
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)