Yes, the Israelites ’ murmuring actually showed a lack of trust in God, who had appointed Moses and Aaron.
(‏ عد ١٤ :‏ ​ ٢ -‏ ٤ ،‏ ١١‏ )‏ فَقَدْ أَظْهَرَ تَذَمُّرُ ٱلْإِسْرَائِيلِيِّينَ أَنَّهُمْ لَا يَثِقُونَ بِٱللهِ ٱلَّذِي عَيَّنَ مُوسَى وَهَارُونَ .‏