It wasnarrated that Qais bin 'Amr said:
"The Prophet (ﷺ) saw a manpraying two Rak'ah after the Subh prayer and said, 'Is the Subhprayerto be offered twice?' The man said to him: 'I did not praythe twoRak'ah before it, so I prayed them (now).' The Messengerof Allah(ﷺ) remained silent." (DE)
English reference (DE): Vol. 1, Book 5, Hadith 1154 (DE)
Arabic reference (DE): Book 5, Hadith 1209 (DE)