יֶשׁ־לְאֵ֣ל יָדִ֔י לַעֲשׂ֥וֹת עִמָּכֶ֖ם רָ֑ע וֵֽאלֹהֵ֨י אֲבִיכֶ֜ם אֶ֣מֶשׁ ׀ אָמַ֧ר אֵלַ֣י לֵאמֹ֗ר הִשָּׁ֧מֶר לְךָ֛ מִדַּבֵּ֥ר עִֽם־יַעֲקֹ֖ב מִטּ֥וֹב עַד־רָֽע׃
Sebenarnya aku berkuasa untuk berbuat jahat kepada kalian; tetapi Allah ayah kalian tadi malam berfirman kepadaku: ‘Jagalah dirimu, jangan engkau berkata apa pun kepada Yakub, baik yang baik maupun yang jahat.’
Rashi
יש לאל ידי means MY HAND HAS THE STRENGTH AND THE POWER — to do you hurt (אל therefore means strength and יש לאל ידי is equivalent to יש אל לידי). Wherever אל is used as a Divine Name it is because it signifies strength and abundance of power.
Chizkuni
יש לאל ידי לעשות עמכם רע, “it is within my power to harm you;” Lavan implies that even G-d is aware of this and is afraid that I will take my revenge of you, and that it why He has warned me concerning you.