Assalaamu alaykum. Are the following texts hadiths?
“Oh Abu Dharr! Beware of procrastination, for you are (in) today and not (in) tomorrow. If there is a tomorrow for you, be tomorrow as you are today. If there is not a tomorrow for you, you will grievously regret the opportunity which you missed today.”
“Oh Abu Dharr! When you wake up in the morning, do not talk to yourself about tonight, and when the night has come, do not worry about the morning, for surely you do not know what your state will be tomorrow.”
“And know that in you are two (dangerous) qualities; laughing at something not amusing, and laziness when not tired.”

All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad is His slave and Messenger.

We did not find the first text directly attributed to the Prophet . Ibn Al-Mubaarak reported it in his book Az-Zuhd as a saying by Al-Hasan Al-Basri, who said, “Son of Adam, beware of procrastination, for you are (in) today and not (in) tomorrow...”

The second text was narrated by At-Tirmithi in his Sunan, by Ibn Abi Shaybah in his Musannaf, and by Al-Bayhaqi in Shu’ab Al-Eemaan as Mawqoof (a report that stops at the level of the Companion) and attributed to Ibn ‘Umar, may Allah be pleased with him, and that he said so to his student Mujaahid.

As for the third text, we did not find it in the reliable books that we have at hand, despite their great number. We searched through the Internet, and we found that some sites of innovators mention it within the advice of the Prophet to Abu Tharr, may Allah be pleased with him, but it may be part of the lies that they made up.

Allah knows best.