Compulsory to have trousers (lower garment) above the ankle

Al-Bukhaari reported that the Prophet
(peace and blessings of Allaah be upon
him) said: "Whatever of the izaar (lower
garment) is below the ankles is in the
Fire." (al-Bukhaari, no. 5787)

The Prophet (peace and blessings of Allaah be upon him) said: "There are three whom Allaah will not look at or praise on the Day of Judgement and theirs will be a painful punishment: the one who wears his garment below his ankles, the one who reminds others of his favours, and the one who sells his product by means of making false oaths" (reported by Muslim, no. 106)

The Prophet (peace and blessings of Allaah be upon him) said: "Isbaal (wearing one’s garment below the ankles) may apply to the izaar (lower garment), the shirt or the turban. Whoever allows any part of these to trail on the ground out of arrogance, Allaah will not look at him on the Day of Judgement." (reported by Abu Dawud, no. 4085, and al-Nisaa’i, no. 5334, with a saheeh isnaad).

Ibn ‘Abbaas reported that the Prophet
(peace and blessings of Allaah be upon
him) said: "Allaah will not look at the one
who wears his lower garment below his
ankles." (Reported by al-Nisaa’i in al-
Mujtabaa, Kitaab al-Zeenah, Baab Isbaal
al-Izaar).

Hudhayfah said: "The Messenger of Allaah (peace and blessings of Allaah be upon him) took hold of the muscle of my calf (or his calf) and said, ‘This is where the izaar should stop; if you insist, it may be lower, but it should not reach the
ankles.’" (Reported by al-Tirmidhi, who said this is a saheeh hasan hadeeth; see Sunan al-Tirmidhi, no. 1783)

Do not take graves/graveyards as places of worship

Volume 2, Book 23, Number 414:

Narrated 'Urwa:

Aisha said, "The Prophet in his fatal illness said, 'Allah cursed the Jews and the Christians because they took the graves of their Prophets as places for praying."' Aisha added, "Had it not been for that the grave of the Prophet (p.b.u.h) would have been made prominent but I am afraid it might be taken (as a) place for praying.

Volume 2, Book 23, Number 425:

Narrated 'Aisha:

When the Prophet became ill, some of his wives talked about a church which they had seen in Ethiopia and it was called Mariya. Um Salma and Um Habiba had been to Ethiopia, and both of them narrated its (the Church's) beauty and the pictures it contained. The Prophet raised his head and said, "Those are the people who, whenever a pious man dies amongst them, make a place of worship at his grave and then they make those pictures in it. Those are the worst creatures in the Sight of Allah."

Sahih Al-Bukhari 

Virtues of voluntary prayers and it is better to pray them at home

What to say upon hearing adhaan (call to prayer)

Ref Sahih Muslim

Leaving the beard grow is compulsory

This page is taken from "the concise presentation of fiqh" by Dr Abdul Azeem Badawi