You know who you should pay,let your conscious guide you.
I'm sure it will be correct and match contracts...

Mullaly
Please look at your contracts. Depending upon what they say, you might want to have a Realtor oversee the transaction. Wouldn't be a shame to sell to your friend then have some unforeseen problems occur that not only spoil your friendship but cost you thousands of dollars?

Call your attorney and present your listing agreements for a legal opinion. Realtors are NOT permitted to give legal advice.

The only thing I'd add to the previous post is to check your listing agreement for a period following the expiration that the agent may be entitled to a commission.

Do you still have an active listing agreement with either of the 2 agents? If you do whichever agent has the active listing agreement is entitled to a commission.
If you do not have an active listing agreement and your friend did not offer to buy the house while you had an active agreement you owe no one any money.