Prayer and Manthra are (seemingly) interchangeable. The idea is to regulate your breathing and focus on the Chit Akash (he inner space where thoughts and emotions come from. When you close your eyes – that is inner space.) This is naturally the location of the third eye where the 2 eyes focus when the eyelids are closed.

Hindu

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youtube: gwPuuKPKI6w|Rudram Chamakam
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Gayathri^1 Manthra:
Oh God, the Protector, the basis of all life, Who is self-existent, Who is free from all pains and Whose contact frees the soul from all troubles, Who pervades the Universe and sustains all, the Creator and Energizer of the whole Universe, the Giver of happiness, Who is worthy of acceptance, the most excellent, Who is Pure and the Purifier of all, let us embrace that very God, so that He may direct our mental faculties in the right direction.

^1 Gayathri means when you burn your body itself (tamas/untruths) and offer it as the lamp to God and was composed by Vishwamithra.

Others:
* So Hum (I am that)
* AUM (exact meaning to be expanded later), but this primordial sound translates to Amen / Ameen.
* Om Namo Bhagavate Vasudevaya (Om, I bow to Lord Vasudeva or Lord Krishna) - when you pray for dynamism (rajas)
* Om Nama Shivaya - when you pray for the dispelling of darkness, untruths and inertia (tamas ^2).
^2 There has to be a 3rd prayer for increasing sattwa and we shall strive to find out what that is
* Vishnu Sahasranaman

Christian

Lords Prayer:
Our Father, Who art in heaven
Hallowed be Thy Name;
Thy kingdom come,
Thy will be done,
on earth as it is in heaven.
Give us this day our daily bread,
and forgive us our trespasses,
as we forgive those who trespass against us;
and lead us not into temptation,
but deliver us from evil. Amen.

Islam

Allaahumma salli ‘ala Muhammad wa ‘ale Muhammad
O Allah, send blessings upon Muhammad and the family of Muhammad

Others:
* 99 Names of Allah
* Surah Al Hamd

Sikhism

WA = Wah = Wow = Astonishing
HE = Everywhere/Anywhere
GU = Dark
RU = Light

Waheguru is he who can illumine (anything) anywhere by vanishing dark in an astonishing manner.

Others:
* ek ong kar sat nam siri wahe guru