It is narrated from Simak bin Harb (may Allah have mercy on him) that he said: "I saw Sayyiduna al-Nu'man bin Bashir (may Allah be pleased with them both) praying on a wooden plank."
Imam Ibn Abi Shaybah narrated this report in al-Musannaf. Its chain contains Muhammad bin Jabir al-Hanafi, who is a weak narrator; however, in the light of other sahih reports, performing prayer on pure things that grow from the earth, such as wood or a mat, is permissible in the Shari'ah.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الصلاة / 337
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسنادہ ضعیف » «انفرد به المصنف من هذا الطريق»