The Reason for being given the Title As-Siddeeq:

Hazrat ‘Aa’ishah (radhiyallahu ‘anha) reports that on the occasion of Mi’raaj, when Rasulullah (sallallahu ‘alaihi wasallam) was taken by night from Musjid Haraam to Musjid Aqsa (and thereafter to the seven heavens), then upon his return, he informed the people of Makkah regarding the miraculous journey that transpired during the night.

The people of Makkah doubted the words of Rasulullah (sallallahu ‘alaihi wasallam) and thus began to ridicule him. Some people even reneged from Islam who had previously believed in Rasulullah (sallallahu ‘alaihi wasallam). Nevertheless, when Hazrat Abu Bakr (radhiyallahu ‘anhu) was informed by certain people (who were trying to provoke him) regarding what had transpired, he responded by saying, “Indeed I fully testify to what Muhammed (sallallahu ‘alaihi wasallam) has said. I have believed him in that which is even more difficult to believe, I believe him when he says that revelation comes to him from the heavens to the earth in a single moment during the night or day (so why should I then doubt him in this matter?).”

It was after this incident that he received the title As-Siddeeq (the most truthful).

(Usdul Ghaabah 3/21 and Seerat-ul-Halabiyyah1/379)

Qutaibah bin Sa‘eed (rahimahullah) reports the following:

I once came to the city of Baghdad with the sole intention of meeting Imaam Ahmed bin Hambal (rahimahullah). It then so happened that Imaam Ahmed (rahimahullah) came to me with Yahya bin Ma‘een (rahimahullah).

On meeting, we sat together and engaged in different ‘ilmi discussions. After some time, Imaam Ahmed (rahimahullah) awoke from his place and came to sit in front of me with respect. He then requested, “Please dictate such-and-such Hadith to me.” After I dictated the Hadith to Imaam Ahmed (rahimahullah), he awoke and returned to his place where he again sat as normal. We then resumed our discussions.

عن أبي هريرة رضي الله عنه عن النبي صلى الله عليه وسلم قال يأتي على الناس زمان لا يبالي المرء ما أخذ منه أمن الحلال أم من الحرام (صحيح البخاري رقم 2059)

Hazrat Abu Hurairah (radhiyallahu ‘anhu) reports that Rasulullah (sallallahu ‘alaihi wasallam) said, “A time will dawn upon the people (before Qiyaamah) when a man will have no worry or concern as to whether his income is from halaal sources or haraam sources.”

عن أنس بن مالك رضي الله عنه قال : قال رسول الله صلى الله عليه وسلم : إن أقربكم مني يوم القيامة في كل موطن أكثركم علي صلاة في الدنيا من صلى علي في يوم الجمعة وليلة الجمعة قضى الله له مئة حاجة سبعين من حوائج الآخرة وثلاثين من حوائج الدنيا ثم يوكل الله بذلك ملكا يدخله في قبري كما تدخل عليكم الهدايا يخبرني من صلى علي باسمه ونسبه إلى عشيرته فأثبته عندي في صحيفة بيضاء رواه البيهقي في حياة الأنبياء في قبورهم (القول البديع ص329)

Hazrat Anas bin Maalik (radhiyallahu ‘anhu) reports that Rasulullah (sallallahu ‘alaihi wasallam) said, “Those of you who recite the most durood upon me in the dunya will be closest to me on the Day of Qiyaamah, at every juncture. The one who recites durood upon me during the night of jumu‘ah and the day of jumu‘ah, Allah Ta‘ala will fulfill one hundred of his needs; seventy needs of the Aakhirah and thirty needs of the dunya. After the durood is recited, Allah Ta‘ala will entrust it to an angel who will bring it to me in my qabr, just as your gifts are brought to you. The angel informs me of the person who recited the durood by telling me his name and his family lineage. I then keep the durood by me on a white scroll.”

Imaam Bayhaqi (rahimahullah) has reported this Hadith under the chapter of the Ambiyaa (‘alaihimus salaam) being alive in their graves.