Matthew Poole and continuators on Genesis 31:4

4 And Jacob sent and called Rachel and Leah to the field unto his flocks.

Rachel is first named here, as also Ruth 4. 11. because she was his chief, and, by right, his first and onely designed wife. And therefore it is observable, that in the enumeration of Iacobs Wives and Children, Gen. 46. Leah is onely mentioned by her name, ver. 15. but Rachel is called Iacobs wife, ver. 19. by way of eminency and in a peculiar manner.

Where they might more freely discourse of their business and without fear or interruption.