Hadith 1:

علي بن محمد، عن بعض أصحابنا، عن الخشاب، عن العباس بن عامر، عن ربيع المسلي، عن يحيى بن زكريا الأنصاري، عن أبي عبد الله عليه السلام قال: سمعته يقول: من سره أن يستكمل الايمان كله فليقل: القول مني في جميع الأشياء قول آل محمد، فيما أسروا وما أعلنوا وفيما بلغني عنهم وفيما لم يبلغني

Narrated that Abu Abdillah Imam Sadiq (ع) said,

"Whoever desires that his faith (belief) is perfected & completed then he should say, "Everything that I say in all matters is from the saying of Aal-e-Muhammad (ع) from whatever that they kept secret & whatever they made public, and that which reached me from them and that which has not reached me."

[Source: al-Kafi, Vol. 1, Pg. 391]

Hadith 2:

وبهذا الاسناد قال: قال علي بن الحسين عليهما السلام: إن دين الله عز وجل لا يصاب بالعقول الناقصة والآراء الباطلة والمقائيس الفاسدة، ولا يصاب إلا بالتسليم، فمن سلم لنا سلم، ومن اقتدى بنا هدى، ومن كان يعمل بالقياس والرأي هلك، ومن وجد في نفسه شيئا مما نقوله أو نقضي به حرجا كفر بالذي أنزل السبع المثاني والقرآن العظيم وهو لا يعلم.

From Ali Bin al-Husain (as) who said:

"The religion of Allah عز و جل is not achieved through incomplete minds, and false opinions and corrupt standards/criteria’s.

It is not achieved except through submission, so whoever submits to Us is safe, and whoever takes Us as his guide is guided, and whoever acts upon analogy and opinions has perished.

And whoever finds narrowness inside himself regarding something that We say or decide, has disbelieved in the one who has revealed the seven of the often-repeated [i.e. Surah Hamd] and the great Qur'an while he is ignorant of it."

[Source: Kamal al-Deen wa Tamaam al-Ne'mah, Shaikh Sadooq, Pg. 324]

Hadith 3:

قال علي بن أبي طالب أمير المؤمنين (عليه السلام): إذا سمعتم من حديثنا ما لا تعرفون فردوه إلينا وقفوا عنده وسلموا حتى يتبين لكم الحق ولا تكونوا مذاييع عجلى، إلينا يرجع الغالي، وبنا يلحق المقصر الذي يقصر بحقنا، من تمسك بنا لحق، ومن سلك غير طريقتنا غرق.

Imam Ali (as) said,

"If you hear any of our Hadith which you don't understand then return it to Us, and stop at it (don't make conclusions), and surrender/submit, until it's made clear to you, and don't be hasty spreaders (of secrets?). To Us returns the Ghaali (exaggerators) and the Muqassir who reduce/lessen our rights catchup with Us. Those who hold onto Us will reach, while those who follow other than Our path are drowned."

[Source: al-Khisaal, Shaikh Sadooq, Pg 627]

Hadith 4:

From a dua to be recited during the period of Ghaybah as taught by Imam Mahdi (ع), recorded by Shaikh Sadooq in his book Kamal al-Deen:

واجعلنا يا ربِّ من أعوانه ومقوِّي سلطانه والمؤتمرين لأمره ، والرَّاضين بفعله ، والمسلّمين لأحكامه

"And make us, O my Lord, of his supporters, of the strengtheners of his authority, of those carrying out his orders, of those satisfied with his actions, of those submissive to his judgments"

[Source: Kamal al-Deen, Shaikh Sadooq, Vol. 1, Pg. 515]

Read the complete dua at the below link:

http://duas.org/pdfs/Allahummaarrifni.pdf

Hadith 5:

Imam Baqir (as) said,

الإمام الباقر عليه السلام : لا يُحِبُّنا عَبدٌ ويَتَوَلّانا حَتّى يُطَهِّرَ اللّهُ قَلبَهُ ، ولا يُطَهِّرُ اللّهُ قَلبَ عَبدٍ حَتّى يُسَلِّمَ لَنا ويَكونَ سِلما لَنا ، فَإِذا كانَ سِلما لَنا سَلَّمَهُ اللّهُ مِن شَديدِ الحِسابِ ، وآمَنَهُ مِن فَزَعِ يَومِ القِيامَةِ الأَكبَرِ

"No slave of Allah would love us and believe in our Divine authority (Wilayah) except that Allah will cleanse his heart. And Allah will not cleanse the heart of a person until he submits to Us and is at peace with Us. When one is at peace with us, Allah will safeguard him against the severity of the Day of reckoning and grant him security against the great terror on the Day of Judgment"

(part of a lengthy hadith)

[Source: Al-Kaafi Vol.1 Pg.194]

Hadith 6:

حمدويه، قال: حدثنا محمد بن الحسين، عن الحكم بن مسكين الثقفي، قال: حدثني أبو حمزة معقل العجلي، عن عبد اللّه بن أبي يعفور، قال

قلت لأبي عبد اللّه (عليه السلام): و اللّه لو فلقت رمانة بنصفين، فقلت هذا حرام و هذا حلال، لشهدت أن الذي قلت حلال حلال، و ان الذي قلت حرام حرام، فقال: رحمك اللّه

Narrated from Abdullah bin Abi Yafur:

“I said to Abu Abdillah Imam Sadiq (عليه السلام): "By Allah if you split a pomegranate into two halfs, and then you said that the first half is forbidden (haram) and the second half is permissible (halal), then I would testify that what you said is permissible is permissible, and what you said is forbidden is forbidden."

So the Imam said: "May Allah have mercy upon you."

[Source: Rijal al-Kishshi, Vol.2 , Pg. 518, Hadith. 462]