Where did Jacob procure this anointing oil? According to his own testimony, when he left the land of Canaan he had nothing with him except the staff in his hand (Genesis 32:10). The Midrash Rabbah explains that he received the anointing oil directly from heaven:
The oil was supplied to him from heaven in abundance, as though from a cruse full to the very top. (Genesis Rabbah 69:8)(FFOZ.org)