The Prophet of Allah ﷺ said, "Good guidance, good conduct, and moderation are one part of twenty-five parts of prophethood."
أن نبي الله ﷺ قال: إن الهدي الصالح، والسمت الصالح، والاقتصاد جزء من خمسة وعشرين جزءا من النبوة.
Abu Dawud (4776), Ahmad (2698), and Bukhari in Adab al-Mufrad (791) all narrated it through routes going back to Qabus bin Abu Dhubyan, that his father told him, from Ibn Abbas, and he mentioned it. Qabus bin Abu Dhubyan is disputed, but his hadith is hasan when it has a basis, and this one does.As for what was narrated from Sahl bin Saad Saadi, who said, the Messenger of Allah ﷺ said, "Deliberateness is from Allah and haste is from Shaytan," this is daif. Tirmidhi (2012) and Baghawi in Sharh al-Sunnah (3598) both narrated it from the hadith of Abu Musab Madani, who said, Abdul-Muhaymin bin Abbas bin Sahl bin Saad Saadi told us, from his father, from his grandfather, who said, and he mentioned it. Tirmidhi said, "This is a gharib hadith. Some of the scholars have spoken about Abdul-Muhaymin bin Abbas bin Sahl and declared him daif on account of his memory." Baghawi mentioned Tirmidhi's statement and affirmed it.I say, it is as Tirmidhi said, for Bukhari and Abu Hatim said of this Abdul-Muhaymin that his hadith is munkar, and Nasai said he is not trustworthy, as Ibn Hibban and others have also spoken about him.Likewise, what was narrated from Abu Saeed as a raised report is not sound, "There is no forbearing person except one who has stumbled, and no wise person except one who has experience." Tirmidhi (2033), Bukhari in Adab al-Mufrad (1/565), and Ahmad (11056) narrated it, and Ibn Hibban (193) and Hakim (4/293) both graded it sahih, all of them through the route of Abdullah bin Wahb, from Amr bin Harith, from Darraj, from Abu Haytham, from Abu Saeed, and he mentioned it. Tirmidhi said, "This is a hasan gharib hadith, we do not know it except through this route," and Hakim said, "Its isnad is sahih."I say, its isnad is daif because of Darraj, who is Ibn Saman Abu Samh, especially in his narration from Abu Haytham. Ibn Zahr differed from him and narrated it from Abu Haytham, from Abu Saeed, as a stopped report attributed only to him. Bukhari narrated it in Adab al-Mufrad (1/565), and this is more sahih than the first version. Ibn Zahr is Ubaydullah bin Zahr Afriqi, who is also daif, but he is in a better position than Darraj.