Prophet Muhammad (SAW) said:
“When the son of Adam gets up in the morning all the limbs humble themselves before the tongue and say: Have taqwa of Allah for our sake, for we are dependant on you, If you are straight/upright, we are straight and If you are crooked, we are crooked.”
(Hasan – narrated by at-Tirmidhee, lbn Khuzaymah and Ibn Hibbaan from Abu Sa’eed al-Khudree marfoo’aan and authenticated by al-Albaanee in Saheeh ul-Jaami’ [351])
Prophet Muhammad (SAW) said:
“If anyone guarantees me whats between his jaws and between his legs, I shall guarantee him Jannah.”
(Saheeh – narrated by al-Bukhaaree from Sahl lbn Sa’d marfoo’aan)
He (SAW) was asked as to what thing brings people into al-Jannah the most and he said: “Taqwaa of Allah and good character.” Then he was asked as to what thing brings people into the Fire the most and he said: “The mouth and the private-parts.”
(Hasan lsnaad – narratated by at-Tirmidhee [20041. Ibn Maajah [42461, Ahmad 12/29 1, 392, 4421, Ibin Hibbaan [ 1923 – al-Mawaarid], al- Baghawee In (Shah us-Sunnah) 113179-801 and others, and It was authenticated by al Albaanee in (as-Saheehah) [977] – from Abu Hurayrah marfoo’aan.)
In a lengthy hadeeth, the Prophet Muhammad (SAW) said:
“Shall I not tell you about the peak of the matter, Its pillar and Its top-most part. I said: Yes 0 Rasoolullaah. He said: The peak of the matter Is Islaam,, the pillar Is salaah; and Its top-most part is Jihaad. Then he said: Shall I not tell you of the controlling of all that? I said: Yes 0 Rasoolullaah, and he took hold of his tongue and said: Restrain this. I said: 0 Nabee of Allah, will what we say be held against us ? He said : May your mother be berieved of you, 0 Mu’aadh ! Is there anything which topples people on their faces – or he said : On their noses – Into Hell-Fire other than the harvests of their tongues.”
(Saheeh – narrated by at-Tirmidhee 121 101, Ibn Maajah (39731 and Ahmad 15/23 11 from Mu’aadh – and the isnaad is hasan as al Albaanee says in (al-‘Irwaa’) [413])
“O Rasoolullaah! Inform me of something which I may hold fast to?” He said: “Say! My Rabb Is Allah and therafter be upright.” I said : “0 Rasoolullaah! What is the thing that you fear most for me?” He (SAW) took hold of his tongue and said: “This!”
(Saheeh – narrated by at- Tirmidhee 11965]. Ibn Maajah [39721 and Ahmad [3/4131 from Sufyaan ibn ‘Abdullaah ath-Thaqafee)
Prophet Muhammad (SAW) said:
“Most of the sins of the Children of Aadam are from his tongue.”
(Saheeh – narrated by at-Tabaraane 13/87/1-21, Abu’sh – Shaykh 12/101 and lbn ‘Asaakir (11389/151 and authenticated in (as-Saheehah) [534])
Prophet Muhammad (SAW) said:
“There Is not a part of the body except that It complains to Allah because of the tongue – due to its haste / rashness.”
(Saheeh – narrated by Abu Ya’laa (Musnad) [1/41. Ibn as-Sunnee [71. Ibn Abee’d-Dunyaa in (al-Warr’) [Q.2/1651, Abu Nu’aym [209/1-2] and al-Bayhaqee in (ash-Shub) [2/65/91 see al-Albaanee’s (as-Saheehah) [535])
The wounds of a sword may heal one day, But the wounds of the tongue – they never may.
Source : Islamic Network