Abu Khaythama narrated to us, (saying): Wakee related to us from Abee Keeraan who said: I heard Shabee saying: ”If you hear anything, write it down even on a wall.” [1]

Abu Khaythama narrated to us, (saying): Wakee related to us, (saying): Ubay related to us from Abdullaah Ibn Hanash who said: ”Indeed, I have seen them (i.e. the people) writing on their palms with reeds in Baraa’ah’s presence. [2]

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References:
[1] Kitaabul Ilm of Abu Khaythama with the checking of Imaam Al Albaanee, narration number:146. page:34]
[2] Kitaabul Ilm of Abu Khaythama with the checking of Imaam Al Albaanee, narration number: 147. page:34]