Valmiki Ramayana Kishkindha Kanda Sarga 28 Shloka 4
Original Shlokaशक्यमम्बरमारुह्य मेघसोपानपङ्क्तिभिः। कुटजार्जुनमालाभिरलङ्कर्तुं दिवाकरम्4.28.4।।
1 source checked for this shloka
मेघसोपानपङ्क्तिभिः by the stairway of clouds, अम्बरम् sky, आरुह्य climbing, दिवाकरम् Sun, कुटजार्जुनमालाभिः with garlands of kutaja and arjuna flowers, अलङ्कर्तुम् to decorate, शक्यम् is possible.
'It is possible to climb up to the sky on the stairs formed by the clouds and decorate the Sungod with garlands made of kutaja and arjuna flowers.