It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever catches one rak'ah of the prayer has caught the prayer."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1813
It is narrated from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) combined Zuhr, Asr, Maghrib and Isha in the year of Tabuk.
From the hadith of Amr bin Dinar it is gharib (singular); Uthman bin Umar alone narrated it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1814
It is narrated from Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him): If a menstruating woman becomes pure before the sun sets, she will pray Zuhr and Asr together, and if she becomes pure before dawn, she will pray Maghrib and Isha together.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1815
It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both): If a woman becomes pure during the time of the Asr prayer, she should begin with Zuhr and pray it first, then pray Asr; and if she becomes pure during the time of Isha, she should first pray Maghrib, then pray the Isha prayer.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1816