I heard the Messenger of Allah ﷺ say between the two corners: O Allah, bring us a blessing in this world and a blessing in the next and guard us from punishment of Hell. (Using translation from Abū Dāʾūd 1892)
سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ بَيْنَ الرُّكْنَيْنِ {رَبَّنَا آتِنَا فِي الدُّنْيَا حَسَنَةً وَفِي الْآخِرَةِ حَسَنَةً وَقِنَا عَذَابَ النَّارِ} [البقرة 201]