Keeping to the congregation

It is narrated from Umayr bin Hani (may Allah have mercy on him) that he said: "I was present with Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) in Makkah when al-Hajjaj bin Yusuf was besieging Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with them both). Sayyiduna Ibn Umar (may Allah be pleased with them both) stayed between the two groups (in a neutral position), so sometimes he would join these people (the army of al-Hajjaj) in prayer, and at other times he would pray with those people (the companions of Sayyiduna Ibn al-Zubayr (may Allah be pleased with them both))."
Its chain is sahih (authentic).

It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "A hypocrite cannot keep up the Isha prayer regularly for forty nights in a row," meaning that praying Isha in congregation is not within his capacity.
Imam Abu Dawud al-Tayalisi recorded this report in his Musnad; however, it has been graded da'if (weak) because of the poor memory of the narrator Muhammad bin Abi Humayd in its chain.