Should a Muslim utter the intention (niyyah) when he starts to do an act of worship, such as saying, “I intend to do wudoo’”, “I intend to pray”, “I intend to fast” and so on?

Praise
be to Allaah.

Shaykh al-Islam Ibn Taymiyah was asked about the intention
when starting to do an act of worship such as praying etc., do we need
to utter it verbally, such as saying, “I intend to pray, I intend to
fast”? 

He replied: 

Praise be to Allaah. 

The intention of purifying oneself by doing wudoo’ ghusl
or tayammum, of praying, fasting, paying zakaah, offering kafaarah (expiation)
and other acts of worship does not need to be uttered verbally, according
to the consensus of the imaams of Islam. Rather the place of intention
is the heart, according to the consensus among them. If a person utters
something by mistake that goes against what is in his heart, then what
counts is what he intended, not what he said. 

No one has mentioned any difference of opinion concerning
this matter, except that some of the later followers of al-Shaafa’i
expressed approval of that, but some of the leaders of this madhhab
said that this was wrong. But in the dispute among the scholars as to
whether it is mustahabb to utter one’s intention, there are two points
of view. Some of the companions of Abu Haneefah, al-Shaafa’i and Ahmad
said that it is mustahabb to utter the intention so as to make it stronger. 

Some of the companions of Maalik, Ahmad and others said
that it is not mustahabb to utter it, because that is a bid’ah (innovation).
It was not narrated that the Messenger of Allaah

(peace and blessings of Allaah be upon him) or his Sahaabah did it or
that he commanded anyone among his ummah to utter the intention. That
is not known from any of the Muslims. If that had been prescribed then
the Prophet

(peace and blessings of Allaah be upon him) and his companions would
not have neglected it, as it has to do with worship which the ummah
does every day and night. 

This is the more correct view. Indeed, uttering the intention
is a of irrational thinking and falling short in religious commitment.
In terms of falling short in religious commitment, that is because it
is bid’ah (an innovation). In terms of irrational thinking, that is
because it is like a person who wants to eat some food saying, “I intend
to put my hand in this vessel, take out a morsel of food, put it in
my mouth and chew it, then swallow it, and eat until I have had my fill.”
This is sheer foolishness and ignorance. 

Intention is connected to knowledge. If a person knows
what he is doing then he has obviously made an intention. It cannot
be imagined, if he knows what he wants to do, that he has not formed
an intention. The imaams are agreed that speaking the intention out
loud and repeating it is not prescribed in Islam, rather the person
who has made this a habit should be disciplined and told not to worship
Allaah by following bid’ah and not to disturb others by raising his
voice. And Allaah knows best.