The Prophet ﷺ commanded Ibn Masud to climb a tree to fetch something from it. When he climbed up, his companions looked at the legs of Abdullah bin Masud and laughed at how thin they were.The Messenger of Allah ﷺ said, "What are you laughing at? The leg of Abdullah is heavier in the scale on the Day of Resurrection than Mount Uhud."
أمر النبي ﷺ ابن مسعود فصعد على شجرة، أمره أن يأتيه منها بشيء، فنظر أصحابه إلى ساق عبد الله بن مسعود حين صعد الشجرة، فضحكوا من حموشة ساقيه، فقال رسول الله ﷺ: ما تضحكون؟ لرجل عبد الله أثقل في الميزان يوم القيامة من أحد.
Ahmad (920), Abu Yaala (539), and Tabarani (8516) all narrated it via Mughira, from Umm Musa, who said, "I heard Ali," and mentioned something similar. Umm Musa was a concubine of Ali's, and no one narrated from her except Mughira bin Miqsam Dabbi. Ajli deemed her trustworthy, and Daraqutni said, "Her hadith is sound and may be cited as corroborating evidence." Haythami said in Majma (9/288–289), "Their narrators are the narrators of the sahih, except for Umm Musa, and she is trustworthy," and he attributed it to the three narrators mentioned.As for what was narrated from Abu Khayrah Sabahi, who said, "I was among the delegation from Abdul-Qays who came to the Messenger of Allah ﷺ, and he provided us with arak twigs to clean our teeth with. We said, 'O Messenger of Allah, we have palm fronds, but we accept your generosity and gift.'" The Messenger of Allah ﷺ said, "O Allah, forgive Abdul-Qays, for they accepted Islam willingly, without being compelled, while my own people held back and did not accept Islam except in disgrace, having suffered loss."This is daif. Bukhari reported it in Tarikh al-Kabir (9/28), saying, Khalifa bin Khayat said, "Awn bin Kahmas narrated to us, who said, Dawud bin Musawir narrated to us, from Muqatil bin Hammam, from Abu Khayrah Sabahi," and he mentioned something similar. Tabarani reported it in Kabir (22/368–369) via Awn bin Kahmas, with the same wording. Abu Ahmad Hakim reported it in Al-Asami wal-Kuna (4/362), via Bukhari, in abridged form. Haythami said in Majma (2/100), after attributing it to Tabarani in Kabir, "Its isnad is hasan."I say, it includes Awn bin Kahmas, who is described as "acceptable" in Taqrib, and he has been corroborated, but his chain also includes someone unknown. Tabarani reported it through another route, via Muhammad bin Humran bin Abdul-Aziz Qaysi, who said Dawud bin Musawir narrated to us with the same wording, and it includes, "I was among the delegation who came to the Messenger of Allah ﷺ, and we were forty men, and he forbade us from using gourd vessels, glazed jars, hollowed-out logs, and tar-coated vessels." He said, then he directed us to arak twigs and said, "Use this to clean your teeth." We said, "O Messenger of Allah, we have grass and make do with it." So he raised his hands and prayed.Haythami said in Majma (5/62), after attributing it to Tabarani, "It includes a group of people I do not recognize." Muqatil bin Hammam was given a biographical entry by Ibn Abu Hatim in Jarh wal-Tadil (8/351), but he said nothing about him, so he is counted among the unknown narrators. Ibn Makula said, "Only one hadith is narrated from this Abu Khayrah, and no one else from the Sabah tribe narrated from the Prophet ﷺ besides him." Al-Ikmal (5/161). If it is as he said, then it contains unknown narrators, along with others who are not known except through this hadith.As for what has been narrated about using the finger to clean the teeth, nothing of it has been established. The most well-known of these is the hadith of Anas, as a raised report, "The fingers suffice in place of the tooth-stick." Ibn Adi reported it in Kamil (7/29), and Bayhaqi (1/40) via his route, from the hadith of Isa bin Shuayb, from Abdul-Hakam Qasmali, from Anas, and he mentioned it. Bukhari said of this Qasmali, "His hadith is rejected." Bayhaqi said, "Isa bin Shuayb also reported it with another isnad from Anas." Then he reported it via his route (that is, via the route of Isa bin Shuayb), from Ibn Muthanna, from Nadr bin Anas, from his father, and he mentioned the hadith. He said, "Isa alone transmitted both isnads, and the preserved version is through the hadith of Ibn Muthanna."Likewise, what has been narrated from Ayesha, and Kathir bin Abdullah bin Amr bin Awf Muzani, and others, is not sound, except that some scholars have interpreted what came through the sahih routes, "that he used to rub his mouth with the tooth-stick," to mean that he rubbed it with his finger, based on what was reported about Uthman, that when he performed wudu, he would rub his mouth with his finger. Abu Ubayd mentioned this in Tuhur (298), and in its isnad is Zubayr bin Abdullah, freedman of the family of Umar, whom Ibn Adi and others criticized.