Narrated Abu Huraira:
The Prophet (p.b.u.h) said, "Seven people will be shaded by Allah under His shade on the day when there will be no shade except His. They are:
(1) a just ruler;
(2) a young man who has been brought up in the worship of Allah, (i.e. worship Allah (Alone) sincerely from his childhood),
(3) a man whose heart is attached to the mosque (who offers the five compulsory congregational prayers in the mosque);
(4) two persons who love each other only for Allah's sake and they meet and part in Allah's cause only;
(5) a man who refuses the call of a charming woman of noble birth for an illegal sexual intercourse with her and says: I am afraid of Allah;
(6) a person who practices charity so secretly that his left hand does not know what his right hand has given (i.e. nobody knows how much he has given in charity).
(7) a person who remembers Allah in seclusion and his eyes get flooded with tears."
Bukhari Vol. 2 : 504
"And your Rubb has decreed that you worship none but Him. And that you be dutiful to your parents. If one of them or both of them attain old age in your life, say not to them a word of disrespect, nor shout at them but address them in terms of honour. And lower unto them the wing of submission and humility through mercy, and say: `My Rubb! Bestow on them Your Mercy as they did bring me up when I was young.''' (17:23,24)
336. Abu Bakrah Nufai` bin Al-Harith (May Allah be pleased with him) reported: The Messenger of Allah (PBUH) said, "Shall I not inform you of the biggest of the major sins?'' The Messenger of Allah (PBUH) asked this question thrice. We said, "Yes, O Messenger of Allah. (Please inform us.)". He said, "Ascribing partners to Allah, and to be undutiful to your parents". The Messenger of Allah (PBUH) sat up from his reclining position and said, "And I warn you against giving forged statement and a false testimony; I warn you against giving forged statement and a false testimony". The Messenger of Allah (PBUH) kept on repeating that warning till we wished he would stop. [Al-Bukhari and Muslim].
337. Abdullah bin `Amr bin Al-`as (May Allah be pleased with them) reported: The Prophet (PBUH) said, "(Of the) major sins are: to ascribe partners to Allah, disobey parents, murder someone, and to take a false oath (intentionally)". [Al-Bukhari].