וַיֹּ֖אמֶר מָ֣ה אֶתֶּן־לָ֑ךְ וַיֹּ֤אמֶר יַעֲקֹב֙ לֹא־תִתֶּן־לִ֣י מְא֔וּמָה אִם־תַּֽעֲשֶׂה־לִּי֙ הַדָּבָ֣ר הַזֶּ֔ה אָשׁ֛וּבָה אֶרְעֶ֥ה צֹֽאנְךָ֖ אֶשְׁמֹֽר׃
And he said: ‘What shall I give thee?’ And Jacob said: ‘Thou shalt not give me aught; if thou wilt do this thing for me, I will again feed thy flock and keep it.
Read kabbalistic (mystical) interpretation of Genesis 30:31: and classical mystical sources.