It wasnarrated that 'Abdullah bin 'Amr said:
"It was said to theMessenger of Allah (ﷺ): 'Which of the people is best?' He said:'Everyone who is pure of heart and sincere in speech.' They said:'Sincere in speech, we know what this is, but what is pure ofheart?'He said: 'It is (the heart) that is pious and pure, withno sin,injustice, rancor or envy in it.'"
English reference: Vol. 5, Book 37, Hadith 4216
Arabic reference: Book 37, Hadith 4356