It is mentioned by Vaishampayana (वैशंपायन) in Mahabharata Vana Parva chapter 44 verse 5
गृहीतास्त्रस्तु कौन्तेयो भ्रातृन् सस्मार पाण्डवः !
पुरंदरनियोगाच्च पञ्चाब्दानवसत् सुखी !!
When Arjuna learned the weapon knowledge, he remembered his brothers, but due to Lord Purandra ( Indra) request , he comfortably stayed for five years. (पञ्चाब्दान् = पञ्च अब्द )
The word “अब्द” – has two meaning 1 A cloud. 2 A year
This word “अब्द” is used in ending verse of Shiva Sahasranamam mentioned in Mahabharata(Anushasana Parva)
स्तवमेतं प्रयत्नेन सदा रुद्रस्य सन्निधौ ।
अब्दमेकं चरेद्भक्तः प्राप्नुयादीप्सितं फलम् ॥ – Mahabharata Anushasana Parva ch 17 verse 171
The one who read this praise of Shiva with devoted efforts in front of Rudra (Shiva) for one year (अब्दमेकं = अब्दम् एकम्), that devotee will get the desired fruits.