Biting while nursing

My 8 month old has two bottom teeth and I think I see the white spots for the top two. He keeps biting while trying to latch. Sometimes he looks at me and then bites, or nibbles to test the water. I tell him no and put him down and he gets mad. He seems.to understand the concept of no. Today we only nursed once because he kept biting. I pumped once and thawed a bottle. He still wants to nurse, he'll latch and suck for a second before pulling away and crying like he knows he's not supposed to bite because he'll bite if he tries to latch after that. So, purpose of long story that's not short, how do I get him stop biting? He doesn't want to stop nursing, and I'm not ready to give it up either.