al-Laith bin Sa'd الليث بن سعد · The Book of the Sunnah

"I used to visit Ibn Mas'ud every Thursday afternoon but he never uttered the words: 'The Messenger of Allah (ﷺ) said.' Then one evening, he said: 'The Messenger of Allah (ﷺ) said,' then he let his head hang down." He said: "I looked at him and saw his shirt was unfastened; his eyes were filled with tears, and his veins were bulging out (with fear). He said:' Or more than that, or less than that, or close to that or…

The Prophet (ﷺ) said: '"Whoever narrates a Hadith from me thinking it to be false, then he is one of the two liars." (Either the one who invents a lie or the one who repeats it; both are liars).

"The Messenger of Allah (ﷺ) said: 'Whoever gives up telling lies in support of a false claim, a palace will be built for him in the outskirts of Paradise. Whoever gives up argument when he is in the right, a palace will be built from him in the middle (of Paradise). And whoever had good behavior, a palace will be built for him in the highest reaches (of Paradise).'"

"The Messenger of Allah (ﷺ) said: 'No one will enter Paradise who has even a mustard-seed's weight of arrogance in his heart, and no one will enter Hell who has even a mustard-seed's weight of faith in his heart.'"

"We were sitting with the Prophet (ﷺ) and he had a stick in his hand. He scratched in the ground with it, then raised his head and said: 'There is no one among you but his place in Paradise or Hell has already been decreed.' He was asked: 'O Messenger of Allah, should we not then rely upon that?' He said: 'No, strive and do not rely upon that, for it will be made easy for each person to do…

"The Messenger of Allah (ﷺ) said: 'The likeness of the heart is that of a feather blown about by the wind in the desert.'"