It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) forbade "iq'a' and tawarruk in prayer".
Only Yahya bin Ishaq al-Saylahini narrated it from Hammad bin Salamah. It has also been reported from him from Hammad and Bahr bin Kathir from Qatadah from Anas, and the first narration is more authentic.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2740