יֶשׁ־לְאֵ֣ל יָדִ֔י לַעֲשׂ֥וֹת עִמָּכֶ֖ם רָ֑ע וֵֽאלֹהֵ֨י אֲבִיכֶ֜ם אֶ֣מֶשׁ ׀ אָמַ֧ר אֵלַ֣י לֵאמֹ֗ר הִשָּׁ֧מֶר לְךָ֛ מִדַּבֵּ֥ר עִֽם־יַעֲקֹ֖ב מִטּ֥וֹב עַד־רָֽע׃
너를 해할만한 능력이 내 손에 있으나 너희 아버지의 하나님이 어제밤에 내게 말씀하시기를 너는 삼가 야곱에게 선악간 말하지 말라 하셨느니라
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.