(a) Abdullah bin Umar (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) used to say the takbir from the time he left his house until he reached the prayer ground.
(b) Ali bin Abi Talib (may Allah be pleased with him) and a group of the Companions narrate the like of what Ibn Umar (may Allah be pleased with them both) narrated, that they used to say the takbir from the morning until reaching the prayer ground.
Musa bin Muhammad bin Ata is munkar al-hadith (his narrations are rejected) and da'if (weak), and al-Walid bin Muhammad al-Muqri is da'if (weak); the narrations of the likes of these two are not taken as proof. The preserved (mahfuz) hadith is from Ibn Umar as his own statement.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6131