On the authority of the Chief of the Believers, Aboo HAfs Umar ibn al-Khattaab may Allah be pleased with him who said: I heard the Messager of Allah(SAW) saying The reward of actions depends upon the intentions and every person will get the reward accoding to what he has intended. Thus, he whose migration was for Allah and his Messager, his migration was for Allah and His Messager, and he whose migration was to achieve some worldly benefit or to take a women in marriage, his migration was for that which he migrated. " (Related by Bukhaaree and Muslim)

Explanation

This Hadeeth is a great foundation regarding the actions of the heart
due to the intentions stemming from the actions of the heart. The scholars have said: This Hadeeth is half of worship because it is the scale of the inward actions. As well, the Hadeeth of Aa'ishah may Allah be pleased with her said whoever innovates into this affair of ours that which is not from it shall have it rejected.

Actions, as well, are based upon what they lead to. Therefore, something that is mubaah (permissible) in its orgin can become obedience what a person intends well: for example, when a person intends in his eating and drinking piety upon obedience to Allah and due to this the prophet (saw) said, Eat the Suhoor(the small meal eaten before Fajr when fasting) for there is blessing in the suhoor.