1 - Kalima Tayyibah - to believe and testify that there is no God worthy of worship but Allah; and that Mohammed (saw) is the Messenger of Allah

The First Kalima

"There is none worthy of Worship but Allah Muhammed is Allah's Messenger."

Hadrat Zaid bin ?Arqam (Allah be pleased with him) narrated that the Messenger of Allah ((SAW)) said: ?Whoever says La ilaaha illal-laahu? sincerely will enter the Paradise.? It was said: And what is the [sign of] sincerity? He said: ?That this kalimah stops him from those things which Allah has forbidden.?

2 - Salah - to establish the prayer, five times a day in their appointed times

Jabiru (May Allah be pleased with him) reported: The Messenger of Allah (SAW) said, "The similitude of the five (obligatory) Salat  is like a river running at the door of one of you in which he takes a bath five times a day.''
[Sahih Muslim].

3 - Zakat - Compulsory tax of 2.5% of a person's wealth to be distributed to the poor each year

Abu Ayyub (May Allah be pleased with him) reported: A man said to the Prophet (SAW): "Direct me to a deed which may admit me to Jannah.'' Upon this he (the Messenger of Allah (SAW) said, "Worship Allah and never associate anything with Him in worship, establish Salat, pay Zakat, and strengthen the ties of kinship.''
[Al-Bukhari and Muslim].

4 - Saum - Fasting from sunrise to sunset in the month of Ramadhan

Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah (SAW) said, "Allah the Exalted and Majestic said: `Every act of the son of Adam is for him, except As-Siyam (the fasting) which is (exclusively) for Me, and I will reward him for it.' Fasting is a shield. When anyone of you is observing fast, he should neither indulge in obscene language nor should he raise his voice; and if anyone reviles him or tries to quarrel with him, he should say: `I am fasting.' By Him in Whose Hand the soul of Muhammad is, the breath of one observing Saum is sweeter to Allah than the fragrance of musk. The one who fasts, experiences two joys: he feels pleasure when he breaks the fast. He is joyful by virtue of his fast when he meets his Rubb.''
[Al-Bukhari and Muslim].3

5 - Hajj - to perform the pilgrimage to the House of Allah (Kaa'ba) in Mecca at least once on a person's life, if he/she is able to do so

Allah, the Exalted, says:

"And Hajj (pilgrimage to Makkah) to the House (Ka`bah) is a duty that mankind owes to Allah, those who can afford the expenses (for one's conveyance, provision and residence); and whoever disbelieves [i.e., denies Hajj (pilgrimage to Makkah), then he is a disbeliever of Allah], then Allah stands not in need of any of the `Alamin (mankind, jinn and all that exists).'' (Qur'an: 3:97)