I have never seen the Messenger of Allah ﷺ observing the supererogatory prayer of the forenoon, but I observed it. And if the Messenger of Allah ﷺ abandoned any act which he in fact loved to do, it was out of fear that if the people practised it constantly, it might become obligatory for them. (Using translation from Muslim 718)
«مَا رَأَيْتُ رَسُولَ اللهِ ﷺ يُصَلِّي سُبْحَةَ الضُّحَى قَطُّ وَإِنِّي لَأُسَبِّحُهَا وَإِنْ كَانَ رَسُولُ اللهِ ﷺ لَيَدَعَ الْعَمَلَ وَهُوَ يُحِبُّ أَنْ يَعْمَلَهُ خَشْيَةَ أَنْ يَعْمَلَ بِهِ النَّاسُ فَيُفْرَضُ عَلَيْهِمْ»