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Isbaal means making the clothes so long that they come beneath the ankle. The prohibition on isbaal is mentioned in the hadeeth of the Prophet (peace and blessings of Allaah be upon him): “Whatever part of the lower garment comes beneath the ankles is in the Fire.” Narrated by al-Bukhaari, 5787. This warning does not apply to something that is makrooh or permissible, rather the warning of Hellfire usually comes to the one who does a haraam action.
If a man says, “I am not doing it to show off,” he is praising himself and that is not acceptable. The hadeeth is general in meaning and includes everyone who lets his garment hang down, whether that is out of pride or otherwise.
With regard to the one who lets his garment hang down out of pride, his punishment will be more severe. The Prophet (peace and blessings of Allaah be upon him) said: “Isbaal may apply to the izaar (lower garment), shirt and turban. Whoever lets any of them hang down out of pride, Allaah will not look at him on the Day of Resurrection.” Narrated by Abu Dawood, 4085; al-Nasaa’i, 5334; with a saheeh isnaad.
http://www.islam-qa.com/en/ref/34365
You should note that making the clothes above the ankle is obligatory, it is not only Sunnah. The Sunnah is to make the izaar (lower garment) come to mid-calf, and this Sunnah is optional. If a person wishes, he may do it, and if he wishes, he may not do it. Sunnah, according to the definition of the scholars, is “That for which the one who does it will be rewarded and the one who does not do it will not be punished.”
Note that what is to be worn at mid-calf length is the izaar (lower garment). The thobe (galabiyah) is not to be worn in this manner; rather the Sunnah in the case of the thobe is to wear it below mid-calf and above the ankles. The same applies to pants, which should be worn above the ankle because the Prophet (peace and blessings of Allaah be upon him) said: “The ankles have no right to the izaar.” (Narrated by al-Nasaa’i in Kitaab al-Zeenah, no. 3529; classed as saheeh by al-Albaani in Saheeh Sunan al-Nasaa’i, no. 4922)
And Allaah knows best.
http://www.islam-qa.com/en/ref/10534/
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