Bismillahirrahmanirrahim...
The Battle of Yarmouk (Arabic: معركة اليرموك‎, also spelled Yarmuk, Yarmuq or, in Greek, Hieromyax, Ἱερομύαξ, or Iermouchas, Ιερμουχάς) was a major battle between the Muslim Arab forces of the Rashidun Caliphate and the armies of the East Roman-Byzantine Empire. The battle consisted of a series of engagements that lasted for six days in August 636, near the Yarmouk River, along what is today the border between Syria and Jordan, south-east of the Sea of Galilee. The result of the battle was a complete Muslim victory which ended Byzantine rule in Syria.
The Battle of Yarmouk is regarded as one of the most decisive battles in military history, and it marked the first great wave of Islamic conquests after the death of Muhammad, heralding the rapid advance of Islam into the then Christian Levant.In order to check the Muslim advance and to recover lost territory, Emperor Heraclius had sent a massive expedition to the Levant in May 636.
As the Byzantine army approached, the Muslims retreated from Syria and regrouped all their forces at the Yarmouk plains close to Arabia where, after being reinforced, they defeated the numerically superior Byzantine army. The battle is also considered to be one of Khalid ibn al-Walid's greatest military victories. It cemented his reputation as one of the greatest tacticians and cavalry commanders in history.

The Bad Consequences of the Tongue


Bismillahirrahmanirrahim....
The Tongue Expresses what is in the Heart
If a person is good, it reflects in their saying. Allah has made it very easy for the tongue to move, and it is not difficult to realize that a person’s tongue moves much more as if compared to the limbs. So if a person is not careful about what he says, even a single saying of his can invalidate his actions. It is for this reason that the whole body warns the tongue saying, “Fear Allah concerning us, for we are (dependant) upon you. If you are upright then we will be upright and if you are corrupt then we will be corrupt.” - Sunan at-Tirmidhi (1912), Mishkaat (4838) and Riyaadh as-Saleheen (2/1521)

And at the same time, the tongue is a great blessing from Allah. If we look at the animals, who are unable to speak, we realize the importance of this great tool of communication. The gratitude that we should show for this great blessing should include, using it for the obedience to Allah, for reading the Qur'aan, for seeking Knowledge, to enjoin good and forbidding evil. The prohibitions of the tongue are that you do not lie, abuse, use foul language, backbite and slander. Allah says in the begining of Soorah al-Mumineen, “Indeed successful are the Believers, those who in their prayer have Khushoo’ (fear of Allah) and those who refrain from vain talk.”
[Soorah Mumineen : 1-3]

Here Allah mentions that refraining from vain talk is a sign of the successful believers. Allah also
mentions refraining from vain talk after he mentions al-Khushoo’. This is because too much talk makes the heart hard. It is not possible to reach the level of Khushoo’ (fear of Allah) unless one refrains from vain talk. Imaam an-Nawawee - rahimahullah - mentions “Know it is incumbent upon all to guard their tongues from most speech, except a word that has some benefit in it....” -
Kitaabul-Adhkaar.

And for those who take heed there is a constant reminder in the verse, “Not a word is said except that there is a watcher by him ready to record it.” - [Soorah Qaf (50):18]

The Messenger of Allah, Muhammed - SallAllahu 'alaihi wa sallam - said, “Whoever believes in Allah and the Last Day should speak good or keep silent.” Imaam ash-Shafiee - rahimahullah - said. “If you wish to speak then it is upon you to think before you speak. If you think there is good in it then speak and if not then do not speak.”

The earlier mentioned Qur'aanic verses, Hadeeth (sayings) of our noble Prophet and advices by the scholars of Islaam are a guide for those searching for salvation against vain talk. So before we talk, should we not ask ourselves....

- Will this saying of mine please Allah?
- Will this saying of mine bring me closer to Allah?
- Does this saying earn with it obedience to Allah?
If yes, then speak, otherwise one should keep quiet.
Wallahu'alam.