Muwatta Malik, Book 1, Hadith 17 (USC-MSA)

Yahya related to me from Malik that he had heard that Abdullah ibn Umar and Zayd ibn Thabit used to say, "Whoever catches the raka`ah has caught the sajda."

وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، وَزَيْدَ بْنَ ثَابِتٍ، كَانَا يَقُولاَنِ مَنْ أَدْرَكَ الرَّكْعَةَ فَقَدْ أَدْرَكَ السَّجْدَةَ ‏.‏

sunnah.com