Finally, it should also be remembered that practices carried out in the time of the rightly guided Khalifas, other Companions and their followers (Allah be plesed with all) can not be considered a Bid’a.
The great Hanafi jurist and Hadith scholar, Imam Abd al-Hay al-Lakhnawi dedicated a whole chapter in support of this in his famous treatise titled ‘Iqamat al-hujjah ala an al-ikthar fi al-ta’abbud laysa bid’a’.
“Practices that were carried out with the approval of the Companions (Allah be pleased with them all) but were not done in the time of the Messenger of Allah (Allah bless him & give him peace), such as the introducing of the first Adhan for Jumu’ah prayer, twenty Rak’ats of Tarawih prayer, etc…can not be considered a Shar’i Bid’a.
There are many evidences for this, just to mention a few:
The Messenger of Allah (Allah bless him & give him peace) said: “Hold fast on to my ways and the ways of the rightly guided Caliphs.” (Abu Dawud, Ahmad, Tirmidhi and others with an authentic chain of narrators).
The Messenger of Allah (Allah bless him & give him peace) said: “follow in the footsteps of the two after me, Abu Bakr and Umar.” (Ahmad, Tirmidhi and Ibn Majah with a sound chain of narrators).
(See for more details: Iqamat al-Hujjah by Imam al-Lakhnawi with notes by Shaykh Abd al-Fattah Abu Ghudda, P.25-58).