Genesis 30:5

וַתֹּאמֶר הִנֵּה אֲמָתִי בִלְהָה בֹּא אֵלֶיהָ וְתֵלֵד עַל־בִּרְכַּי וְאִבָּנֶה גַם־אָנֹכִי מִמֶּֽנָּה

And she said: ‘Behold my maid Bilhah, go in unto her; that she may bear upon my knees, and I also may be builded up through her.’

וַתִּתֶּן־לוֹ אֶת־בִּלְהָה שִׁפְחָתָהּ לְאִשָּׁה וַיָּבֹא אֵלֶיהָ יַעֲקֹֽב

And she gave him Bilhah her handmaid to wife; and Jacob went in unto her.

וַתֹּאמֶר רָחֵל דָּנַנִּי אֱלֹהִים וְגַם שָׁמַע בְּקֹלִי וַיִּתֶּן־לִי בֵּן עַל־כֵּן קָרְאָה שְׁמוֹ דָּֽן

And Rachel said: ‘God hath judged me, and hath also heard my voice, and hath given me a son.’ Therefore called she his name Dan.

וַתַּהַר עוֹד וַתֵּלֶד בִּלְהָה שִׁפְחַת רָחֵל בֵּן שֵׁנִי לְיַעֲקֹֽב

And Bilhah Rachel’s handmaid conceived again, and bore Jacob a second son.