1. Abu Bakra  رضي الله عنه  said that the Messenger of Allah ﷺ said:

“Shall I tell you which is the worst of the major sins?”

He repeated that three times.

They replied, “Yes, Messenger of Allah.”
He said, “Associating something else with Allah and disobeying parents.”
He had been reclining, but then he sat up and said, “Beware of lying.”
Abu Bakra added, “He continued to repeat it until I wished he would stop.” (Authentic)

Commentary:
(1) Allah’s Messenger ﷺ would show how crucial any matter was either by repeating a question regarding the matter or employing emphasis or even changing his posture, all of which he employed in this hadeeth. He could also mildly touch the companion on the chest or hold his hand amongst other means.

(2) The narration shows that some major sins are still worse than some others, and from the worst ones is offending the parents, rebelling against them and severing relationships with them which are all contradictory to being dutiful to them.

(3) It also indicates that the companions رضي الله عنهم had great concerns for the Prophet ﷺ.

2. Warrad, the scribe of al-Mughira bin Shu’ba, said:

“Mu’awiya wrote to al-Mughira and asked, ‘Write down for me something that you heard the Messenger of Allah ﷺ say.’”

Warrad said, “He dictated to me and I wrote out, ‘I heard him forbid asking too many questions, wasting money and idle talk.’” (Authentic)