Marroozi (rahimahullah) narrates the following incident:

I once ushered Ebrahim Al-Husri (rahimahullah), who was a pious man, into the presence of Abu ‘Abdillah, Imaam Ahmad bin Hambal (rahimahullah). When he met Imaam Ahmad (rahimahullah), Ebrahim Al-Husri (rahimahullah) mentioned, “My mother saw a dream relating to you. She saw such-and-such in her dream, and she also mentioned seeing you in Jannah.” When Imaam Ahmad (rahimahullah) heard this, he replied, “O my nephew! People would narrate similar dreams to Sahl bin Salaamah, whereas he was a person who was involved in murder and bloodshed.” Imaam Ahmad (rahimahullah) then explained, “A good dream should please one, but should not deceive one (through causing him to feel complacent of his piety and righteousness).”

(Siyar A’laam min Nubalaa vol. 11 pg. 227)