Sayyiduna Ali (may Allah be pleased with him) and Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) say: Whoever does not catch the bowing (ruku') is not to count the prostration.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2402
Qatadah relates: Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) found some people sitting at the end of the prayer, and he said: If Allah wills, you have caught (the congregational prayer).
Al-Tabarani recorded it in al-Mu'jam al-Kabir. The narrator Qatadah did not hear from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2403
Hadith Gradingمحدثین:إسنادہ منقطع، لہٰذا ضعیف ہے؛ کیونکہ قتادہ کا ابن مسعود رضی اللہ عنہ سے سماع ثابت نہیں۔
Zayd bin Wahb relates: Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) and I entered the mosque while the imam was in the bowing position. We went into bowing, then walked forward until we joined the row. When the imam finished, I stood up to make up the prayer I had missed, and Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: You have caught that rak'ah.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2404
Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) says: When a person goes into bowing and walks to join the row: if he enters the row before the people raise their heads, he is to count that rak'ah; and if the people raise their heads before he reaches the row, that person is not to count that rak'ah.
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains Zayd bin Ahmar, and I have not found anyone who mentions him.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2405