Musnad Ahmad 25:162

Yahya narrated to us, from Ubayd Allah ibn al-Akhnas, who said: al-Walid ibn Abd Allah narrated to us, from Yusuf ibn Mahak, from Ibn Abbas, from the Prophet, peace and blessings be upon him, who said: "No man acquires a branch of knowledge from the stars, except that he has acquired a branch of magic by it; the more he increases, the more he increases."