In the narration of an-Nasa'i:

'We used to say before at-Tashahhud become obligatory on us'.

وَلِلنَّسَائِيِّ : { كُنَّا نَقُولُ قَبْلِ أَنْ يُفْرَضَ عَلَيْنَا اَلتَّشَهُّدُ } .‏ [1]‏