The permissibility of withdrawing for worship in times of tribulation

It is narrated from Sayyiduna Hudhayfah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "At the beginning of the two hundredth year (of the Hijrah), the best of you will be the one light of burden (al-khafif al-hadh)." It was asked: O Messenger of Allah! What is meant by lightness of burden (khiffat al-hadh)? He (peace and blessings be upon him) said: "The person who has neither family nor wealth (as a burden)."
Imam Abu Ya'la narrated this hadith in his Musnad; its chain contains a narrator named Rawwad bin al-Jarrah, who has a weak memory.

It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Soon a time will come upon people in which remaining single (not marrying) will be permissible, and the religion of a religious person will not remain safe unless he flees with his religion, to protect it, from one mountain peak to another and from one burrow to another, just as a bird flies off with its chicks and as a fox runs off with its young. So let him (even in such a state) establish the prayer, pay the zakah, and keep away from people except in good deeds. And he said: To graze a hundred white goats on the mountain called Sal' is dearer to me than the kingdom and rule of Banu al-Nadir, and that will be when circumstances become such and such (full of fitnah and corruption)."
Imam al-Harith narrated this narration in his Musnad (Bughyat al-Bahith); its chain contains Mas'adah bin Sadaqah, a da'if (weak) narrator. However, encouragement towards seclusion in times of fitnah to save one's religion has also come in other authentic hadiths.