You can use that offer to negotiate with your current employer. If your friend hasn't given you a number yet, ask what they'll be willing to offer you. Use that

You can use that offer to negotiate with your current employer. If your friend hasn't given you a number yet, ask what they'll be willing to offer you. Use that number to talk to your current employer and say something like "I got this offer from another company. I really enjoy working here and if you can match this offer, I'd rather stay here."