abu zaid ahmad bin sahal says in his book al bid wa tareekh

mawia made this secret plan with ja’ada bin ashat bin qais that if she gives poison to imam hasan, he will marry her off to yazeed, so she gave poison and killed him (imam hasan asws); so mawia told her after giving her one hundred thousand dirham that yazeed is dear to us, how can someone be good for him who is not good for son of prophet asws

[al bid wa tareekh, balkhi, page 238, printed beirut]

contributed by brother syed hasni along with scans