Ikhlas,Quranic Ayats about sincerity of intention, meaning and Definition Translation of Al niyyeh Surah al Bayyinah ayah 5,Al hajj Ayah 37,Ali-Imran Ayah 29

Al Ikhlaas and Al Niyyeh 
Sincerity and Significance of Intentions and all Actions, Apparent and Hidden
In all actions and sayings, apparent and concealed we should do for Allah only No other intention for pleasing or showing anyone else should be there.......If it will be our Amaal will be wasted Rather counterproductive on day of Qiyamah. May Allah save from Riya and Give us Ikhlas e Niyah.

Allah the Most High declared:

They were commanded not, but that they should worship Allah and worship none but Him alone, and perform the prayer, and give in alms. For that is the Correct Religion
[Surah al-Bayyinah : Ayah 5].

It is neither their flesh nor their blood that reaches Allah, but it is piety from you that reaches Him
[Surah al-Hajj : Ayah 37].

Say (0 Muhammad): Whether you conceal what is in your hearts or disclose it, Allah is aware of it
[Surah Ali-'Imraan : Ayah 29].

Narrated 'Umar bin Al-Khattab (May Allah be pleased with him), reported: Messenger of Allah (PBUH) said, [Al-Bukhari and Muslim].

"The deeds are considered by the intentions, and a person will get the reward according to his intention. So whoever emigrated for Allah and His Messenger, his emigration will be for Allah and His Messenger; and whoever emigrated for worldly benefits or for a woman to marry, his emigration would be for what he emigrated for". 

al-Niyyeh according to the the Scholars comprises of two definitions/meaning:

The First Meaning: al-Niyyeh refers to the different objectives [desired] in the performance
of the deed.
For example: Was the action performed for the sake of Allah alone, without an associate, or was
it performed partially for Allah and partially for other than him?
This defmition is the one which the People of Knowledge speak of in their works and their
utterances concerning al-Ikhlaas and it's consequence.

The Srcond Definition: al-Niyyeh differentiates between the various acts of worship.
For example: It distinguishes between the Dhuhr prayer and the 'Asr prayer, or it distinguishes.Means it is same four Rikah prayer but Change of Intention will change it.
between the observance of the fast during the month ofRamadhan and outside that month.
It also differentiates between actions of worship and those performed habitually or by
convention. For example:
The action of washing from impurity with intention to Wadhu will give reward and washing for the
purpose of refreshment will have another status.It is for all action with the change of intention the status of action and its reward will change.