The stabbing happened around 3 p.m. at the Chevron near Ventura and Cedar. Police say the suspect approached a man and contacted him.
When the victim rebuffed, the suspect pulled out a knife and started swinging. The victim received cuts to his hands and his cheek but is expected to be okay.
Investigators say the suspect ran westbound on Ventura and was wearing black clothing with a black backpack on.
Officers are now reviewing surveillance video to identify the suspect.