Ibn Mas’ūd – Allāh be pleased with him – used to say the takbīr during the Days of Tashrīq thus:

Allāh is Greatest, Allāh is Greatest, none deserves worship but Allāh. Allāh is Greatest, Allāh is Greatest, and to Him is all praise.

Ibn Abī Shaybah, Al-Muṣannaf Vol.2 p74. Shaykh Al-Albānī said its chain of narration is Ṣaḥīḥ.

‘Alī – Allāh be pleased with him – used to say the takbīr following the Fajr prayer on the Day of ‘Arafah until the ‘Aṣr prayer of the last day of Tashrīq – he used to say it after ‘Aṣr prayer (then stop).

Ibn Abī Shaybah, Al-Muṣannaf Vol.2 p72. Shaykh Al-Albānī said its chain of narration is good.

See Irwā Al-Ghalīl Vol.3 p125.