Ibrahim al-Nakha'i narrates this saying of Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him): "Whoever prays four rak'ahs while travelling shall repeat his prayer."
Al-Tabarani recorded it in al-Mu'jam al-Kabir; Ibrahim al-Nakha'i did not hear from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2938