Sayyiduna Malik Ibn Buhaynah (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) entered the mosque when the prayer had begun, and a man was praying two rak'ahs. He (peace and blessings be upon him) said: "Will you pray four rak'ahs for the morning prayer?"
The correct view is that of those who said Abdullah bin Malik Ibn Buhaynah; he is Abdullah bin Malik bin al-Qishb of Azd Shanu'ah, and his mother is Buhaynah bint al-Harith bin al-Muttalib. Ali bin al-Madini said this.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4541