Komentarz do Rodzaju 31:4

ויקרא לרחל וללאה AND HE CALLED RACHEL AND LEAH — First Rachel and afterwards Leah for she was the chief wife of the house for whose sake Jacob had entered into relations with Laban. Even the descendants of Leah admitted this (that Rachel was the principal wife), for Boaz and his Law-Court who were of the Tribe of Judah (Leah’s son) said (Ruth 4:11) “like Rachel and like Leah which two did build etc.”, mentioning Rachel before Leah (Genesis Rabbah 71:2).

'וישלח יעקב וגו, he requested that his wives join him in the field where he was busy tending the flocks.

ויקרא לרחל וללאה, “he sent word to Rachel and Leah to come to him;” the Torah mentions the names of these wives by name as they were the senior wives; he did not have to send messages to Zilpah and Bilhah and their respective children as they were in his proximity all the time, helping him tend the flocks.