Qatadah says: Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: There is no harm if you go into bowing before reaching the row.
Al-Tabarani recorded it in al-Mu'jam al-Kabir. Qatadah did not hear from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), and the narrators of this narration are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2540