Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both), concerning the saying of Allah Almighty: "And let no scribe or witness be harmed" [Surah al-Baqarah: 282], says: (It is) that the witness and the scribe are called and they say: We are busy; and he says: You have been commanded to come when you are called. Let neither of them be put under pressure.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20602