Hadith 1:

Narrated as part of hadith from Imam al-Rida (عليه السلام) about the coming of al-Qaim (عليه السلام):

إِنَّ هَذَا الْأَمْرَ لَيْسَ يَجِي‌ءُ عَلَى مَا يُرِيدُ النَّاسُ، إِنَّمَا هُوَ أَمْرُ اللَّهِ تَبَارَكَ وَ تَعَالَى وَ قَضَاؤُهُ وَ الصَّبْرُ، وَ إِنَّمَا يَعْجَلُ مَنْ يَخَافُ الْفَوْتَ

"Indeed this matter (i.e. reappearance/zuhoor) will not come based on what people desire. But it is only a command of Allah (تبارك و تعالى) and His decree, and patience, and only the one who fears of losing/missing out makes haste."

[Source: Qurb al-Asnad, Pg. 381]

Hadith 2:

حدثنا جعفر بن محمد بن مسرور رحمه الله قال: حدثنا الحسين بن محمد ابن عامر، عن عمه عبد الله بن عامر عن محمد بن ابى عمير عمن ذكره عن ابى عبد الله عليه السلام قال: قلت له ما بال أمير المؤمنين " ع " لم يقاتل فلانا وفلانا وفلانا؟ قال لآية في كتاب الله عزوجل: (لو تزيلوا لعذابنا الذين كفروا منهم عذابا اليما) قال قلت وما يعني بتزايلهم؟ قال ودائع مؤمنين في أصلاب قوم كافرين وكذلك القائم " ع " لن يظهر ابدا حتى تخرج ودائع الله تعالى فإذا خرجت ظهر على من ظهر من اعداء الله فقتلهم.

The narrator said, I said to Abu Abdullah Imam Sadiq (ع), "What is the matter that Amir Al-Momineen (ع) did not fight against so and so, and so and so, and so and so?" 

The Imam (ع) said, "Due to a Verse in the Book of Allah (عز وجل),  "Had they been widely separated one from another, We would surely have Punished those who disbelieved from among them with a painful Punishment" (48:25). 

I (the narrator) said, "What is the meaning of being separated from them?" 

The Imam (ع) said, "Deposits of the Believers in the loins (Sulb) of the disbelieving people. And such is the case that al-Qaim (ع) would not appear, ever, until Allah (تعالى) extracts the deposits (i.e. all believers to be born out of disbelievers). So when these come out, He would get the upper hand over the enemies of Allah (عز وجل), so He (ع) would kill them".

[Source: Illal Sharaye - Shaikh Sadooq Vol. 1, Chapter 122, Hadith. 2]

Hadith 3:

رُوِيَ عَن جابِرٍ الجُعفِيِّ، قالَ: قُلتُ لِأَبي جَعفَرٍ عليه السلام: مَتى‌ يَكونُ فَرَجُكُم؟ فَقالَ: هَيهاتَ هَيهاتَ، لا يَكونُ فَرَجُنا حَتّى‌ تَغَربَلوا ثُمَّ تَغَربَلوا ثُمَّ تَغَربَلوا، يَقولُها ثَلاثاً، حتّى‌ يُذِهبَ (اللَّهُ تَعالَى) الكَدِرَ، ويُبقِي الصَّفوَ

Narrated that Jabir al-Jofi asked Abu Jafar Imam Baqir (عليه السلام), "When will Your relief/joy (faraj) come?"

Imam (عليه السلام) responded, "How far it is, how far it is. Our relief/joy (farah) will not come untill you are sieved/filtered and then sieved/filtered, the Imam said this 3 times, untill Allah (تعالى) remove the impure ones and only the pure one remain."

[Source: al-Ghaybah, Shaikh Toosi, Pg. 339]