An example was Prophet Abraham who was mentioned in Quran specifically as the Shia of Noah:
“And most surely Abraham was among the Shia of him (i.e., Noah)” (Quran 37:83)
(Notice that the word “Shia” is explicitly used, letter by letter, in the above verse as well as the following verse.) In another verse, Quran talks about the Shia of Moses versus the enemies of Moses:
“And he (Moses) went into the city at a time when people (of the city) were not watching, so he found therein two men fighting, one being of his Shia and the other being his enemy, and the one who was of his Shia cried out to him for help against the one who was of his enemy” (Quran 28:15)
In the above verse of Quran, one is named the Shia of Moses (AS) and the other one is named the enemy of Moses, and the people at that time were either the Shia or the enemy of Moses (AS). Thus Shia is an official word used by Allah in His Quran for His high rank prophets as well as their followers. Do you want to say Prophet Abraham was sectarian? How about Prophet Noah and Prophet Moses?
If somebody calls himself a Shia, it is not due to any sectarianism, nor any innovation. It is because Quran has used the phrase for some of His best servants. The above verses that I mentioned in support of Shia, has used this term singular form (i.e., one group of followers). This means that it has special meaning, such as: THE Shia of Noah (AS), THE Shia of Moses (AS). Also in the History of Islam, Shia has been specially used for the “followers of Ali”. The first individual who used this term was the Messenger of Allah himself:
The Messenger of Allah said to Ali: “Glad tiding O Ali! Verily you and your companions and your Shia (followers) will be in Paradise.”
Sunni references:
Fadha’il al-Sahaba, by Ahmad Ibn Hanbal, v2, p655
Hilyatul Awliyaa, by Abu Nu’aym, v4, p329
Tarikh, by al-Khateeb al-Baghdadi, v12, p289
al-Awsat, by al-Tabarani
Majma’ al-Zawa’id, by al-Haythami, v10, pp 21-22
al-Darqunti, who said this tradition has been transmitted via numerous authorities.
al-Sawa’iq al-Muhriqah, by Ibn Hajar Haythami , Ch. 11, section 1, p247
Salaam
ramesha