Sayyiduna Umar (may Allah be pleased with him) says that the prayer during travel is two rak‘ahs, each of the two ‘Eids is two rak‘ahs, and Jumu‘ah is also two rak‘ahs, and all these prayers are complete; there is no shortening in any of them, as has been pronounced by the tongue of Prophethood.
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 257
Hadith Gradingحکم دارالسلام:حديث صحيح، رواية عبدالرحمن بن أبى ليلى عن عمر مرسلة، لكنه بين الواسطة بينهما عند غير الإمام أحمد، وهو كعب بن عجرة، فصح الاسناد بذكر كعب